Event info
On 11 and 12 april thecity breathes running during the 45th edition of the NN Marathon Rotterdam. The NN Marathon Rotterdam is, due to the flat course, one of the fastest marathons worldwide and one of the most visited marathons.
But what makes it so special is that the hundreds of thousands of enthusiastic spectators along the course ensure a true running festival. They cheer, clapp and motivate. They make sure that no other marathon in the Netherlands can match the atmosphere of the NN Marathon Rotterdam. Nothing feels better than that one moment when you, after all those meters you’ve covered, cross the finish line. Be proud of yourself, believe in what you do and show Rotterdam what your strength is. We’ll see you at the start!
#demooiste
- Participate in an international sport event.
- Outstanding atmosphere along the entire course
- Your finish time officially measured
- Unique medal as a souvenir
Program
| Time | Activity | Location |
| 10.00 – 20.00 hr | Marathon Sport Expo (pick up bib numbers and t-shirts) | Postillion Convention Centre WTC Rotterdam |
| 11.00 – 12.00 hr | Press conference elite athletes | Hilton Hotel Rotterdam |
| 19.00 – 20.30 hr | Church service | Scots International Church |
*subject to change
| Time | Activity | Location |
| 07.00 – 10.00 hr | Pick up stamp cards walk | Postillion Convention Centre WTC Rotterdam |
| 10.00 hr – 19.00 hr | Marathon Sport Expo (pick-up bib numbers and t-shirts) | Postillion Convention Centre WTC Rotterdam |
| 08.00 – 09.00 hr | Start The Marathon Rotterdam Walk – 15 km | Coolsingel – WTC |
| 09.00 – 10.00 hr | Start The Marathon Rotterdam Walk – 10 km | Coolsingel – WTC |
| 10.00 – 10.30 hr | Start The Marathon Rotterdam Walk – 5 km | Coolsingel – WTC |
| 12.30 hr | Start Your Marathon Challenge | Coolsingel – WTC |
| 13.00 hr | Closing finish Your Marathon Challenge and The Marathon Rotterdam Walk | Coolsingel |
| 13.30 hr | Start NN Kids Runs 1 km – 6 years old | Coolsingel – WTC |
| 13.55 hr | Start NN Kids Runs 1 km – 7 years old | Coolsingel – WTC |
| 14.20 hr | Start NN Kids Runs 1 km – 8 years old | Coolsingel – WTC |
| 14.45 hr | Start NN Kids Runs 1 km – 9 years old | Coolsingel – WTC |
| 15.10 hr | Start NN Kids Runs 1 km – 10 years old | Coolsingel – WTC |
| 15.30 hr | Start NN Kids Run 2,5 km – 7 till 10 years old | Coolsingel – WTC |
| 15.50 hr | Start NN Kids Runs 2,5 km – 11 till 15 years old | Coolsingel – WTC |
| 16.15 hr | Start City Run Rotterdam (4,2 km) | Coolsingel – WTC |
| 17.00 – 21.30 hr | Pasta Party | Postillion Convention Centre WTC Rotterdam |
*subject to change
| Time | Activity | Location |
| 07.00 – 10.00 hr | Marathon Sport Expo (pick-up bib numbers and shirts) | |
| 09.15 – 10.00 hr | 09.15 till 10.00 hr – Start 10 KM Rotterdam | Burg. van Walsumweg |
| 08.15 hr | Start area open | Burg. van Walsumweg |
| 09.15 hr | Start wave 1 (closure of start area at 9:20 AM) | Burg. van Walsumweg |
| 09.30 hr | Start wave 2 (closure of start area at 9:35 AM) | Burg. van Walsumweg |
| 09.45 hr | Start wave 3 (closure of start area at 9:50 AM) | Burg. van Walsumweg |
| 10.00 hr | Start wave 4 (closure of start area at 10:05 AM) | Burg. van Walsumweg |
| 10.00 – 10.40 hr | 10.00 till 10.40 hr – Start NN Marathon Rotterdam | Schiedamsedijk |
| 09.00 hr | Start area open | Schiedamsedijk |
| 10.00 uur | Start wave 1 (closure of start area at 9:35 AM) | Schiedamsedijk |
| 10.07 hr | Start wave 2 (closure of start area at 10:10 AM) | Schiedamsedijk |
| 10.14 hr | Start wave 3 (closure of start area at 10:20 AM) | Schiedamsedijk |
| 10.21 hr | Start wave 4 (closure of start area at 10:30 AM) | Schiedamsedijk |
| 10.28 uur | Start wave 5 (closure of start area at 10:35 AM) |
Schiedamsedijk |
Make sure you are in the correct start wave before the closure of your start box. It is allowed to start in a later wave.
*subject to change
Bib numbers
Bib numbers
Participants in the marathon distance and other running events will receive one bib number with a chip for timing (wear it clearly visible on your chest).
You will receive safety pins from us. Make sure you don’t wear anything over your tag, otherwise time registration will not work properly. Like a bag, vest or when you cross the finish line with your child, etc. Make sure your bib number with tag is always visible.
Fill in the medical passport
For your own safety, you are strongly requested to fill in the medical passport on the back of the bib number. You must wear your bib number on your chest. The bib number is personal and non-transferable. In the event of an emergency, your bib number serves as a medical passport.
Participants can pick up their bib number on Friday, April 10, Saturday, April 11, or Sunday, April 12, 2026, at the Marathon Sport Expo in the WTC building by showing your e-ticket. The e-tickets will be sent one week prior to the event weekend. If you register by March 8 at the latest, your first name will appear on your bib number.
When collecting your starting number, you must identify yourself by showing physical identification (such as a passport, ID card, or driver’s license). You are permitted to collect someone else’s starting number by showing the physical identification of the owner of the bib number. Copies, photos, etc. are not permitted.
Participants in the NN Kids Runs with a Dutch address will receive their bib number at home if registered before March 8.
Participants with an address outside the Netherlands can pick up their bib number on Friday, April 10, Saturday, April 11, or Sunday, April 12, 2026, at the WTC building by showing your e-ticket. The e-tickets will be sent one week prior to the event weekend. If you register by March 8 at the latest, your first name will appear on your bib number.
When collecting your starting number, you must identify yourself by showing physical identification (such as a passport, ID card, or driver’s license). You are permitted to collect someone else’s starting number by showing the physical identification of the owner of the bib number. Copies, photos, etc. are not permitted.
The bib numbers for schools will be sent to the contact person in the week prior to the NN Marathon Rotterdam. If you register by March 8 at the latest, your first name will appear on your bib number. Schools that register after this date or add extra participants can collect these bib numbers at the Marathon Sport Expo in the WTC building.
Business Duo teams and Business Relay teams will receive their Business package by mail in the week of the event. The packages will be sent if registered by March 8 at the latest.
The Business package contains the teams’ bib numbers. The starting number has a text box on the inside in which general and medical information can be stated. These bib numbers do not have a chip. Along with these bib numbers, you will also receive a bib band with an exchange bib number that has a chip attached. You attach the EXCHANGE bib number to this starting number band. This band including bib number is the exchange item. This gives each runner a time in the results.
Participants from companies taking part in the regular events must pick up their bib number at the Marathon Sport Expo.
Start waves
Providing your expected finish time
The allocation of start waves for the events is based on the expected finish time you provide in the registration form. Due to the production of bib numbers, it is possible to enter your expected finish time until February 1. After this, all participants are automatically assigned to the last start wave. Please note: changing the start wave is then no longer possible. Due to the production of the bib numbers, it is possible to enter your expected finishing time up to and including February 28.
Frequently asked questions
Registration
Can I cancel my registration?
Cancelling your registration for the marathon distance is only possible until March 1, 2026, and only if you purchased a cancellation insurance at the time of registration. The cancellation insurance can only be used for the NN Marathon Rotterdam. For the marathon distance it is not possible to convert it to another distance later. Contact the organization to make use of your cancellation policy.
Please note: the cancellation insurance can only be purchased during registration. After registration, it is not possible to add the insurance or change your registration to another event. Transferring or reselling a bib number is not allowed. The cancellation insurance is the only way to receive a refund of the registration fee.
Cancelling your registration for other distances, such as the 1/4 Marathon Rotterdam, is not possible. Please refer to the terms and conditions for more information.
I have not received a confirmation email, what to do?
After you have registered, you will receive a confirmation email. So make sure that your email address has been entered correctly. Also check your spam box if you have not received the email within 30 minutes. If it is not there either, please contact us.
Will there be a half marathon?
No, there is no half marathon for individual participants. Do you still want to run a half marathon? Then register with a colleague for the Business Duo Marathon.
How to invite team members
After registering your company, school or group, you must invite all team members. Please follow these steps:
1. Go to your dashboard throughout the link in your confirmation mail.
2. Click on “manage my teammembers”.
3. Invite a teammember by typing the e-mailaddress and click on send. The participant will receive the invite per mail.
4. Through the link the participant will fill in the registrationform. The participant don’t need to pay for this. They can choose extra options like a t-shirt or medal engravement. They need to pay for it at the end of the process.
5. The registration will appear in the dashboard of the groupleader as registrated. This allows the contact to keep track of how many places are completed, invited, and open.
Can I change my registration?
You can change your registration via your dashboard. You can change competitions there, add products and adjust data. Please note: this can be done until March 1, 2026.
Can I change my distance?
For the marathon distance it is not possible to convert it to another distance later.
For the other distances, you can change your distance until April 10 by logging into your dashboard, provided the desired distance is not sold out. You can change to a higher distance provided that the difference in price is paid. If you change to a lower distance, the registration fee (or part ) will not be refunded. If you change distances after March 1, you will start with the bib number of your original distance.
Steps to take:
- Log in on your dashboard. The link is in the confirmation email;
- Click on “change competition”;
- Choose the competition you want to run and click ‘continue’.
- If you have chosen a higher distance and there is a price difference, you must pay the amount due by clicking on ”checkout”.
- If a distance is sold out, it is not possible to change your event.
What are the minimum ages to participate?
For age limits, the age on the day of the event applies.
- NN Marathon Rotterdam: 18 years old
- 10 KM Rotterdam: 14 years old
- City Run Rotterdam: 12 years old
- NN Kids Run 2,5 km: 7-15 years old
- NN Kids Run 1 km: 6-10 years old
- Business Duo Marathon: 18 years old
- Business Relay Marathon: 14 years old
- Your Marathon Challenge: no minimum age
- The Marathon Rotterdam Walk: no minimum age
How can I register for the Pasta Party?
On Saturday, April 11, the Pasta Party will take place at the Postillion Convention Centre WTC. Here you can enjoy a delicious unlimited pasta buffet. You can order tickets when you register.
If you are registered, but have not ordered tickets, please come to the helpdesk at the Marathon Sport Expo. Tickets are still sold on site while supplies last. It is possible to pay by card.
When does registration close?
You can register (digitally) up to the day prior to the relevant distance, provided it is not sold out. An exception to this is the marathon distance; bib numbers for this event are allocated through a random selection among all pre-registrations.
Is there a waiting list for sold out distances?
There is no waiting list for the marathon distance. All available spots will be randomly allocated among all pre-registrations.
Can I transfer my race entry for the marathon distance?
It’s temporarily possible to transfer your marathon race entry. You can transfer your marathon bib number to another person until March 31, 2026.
- Transfers can only be made via the original owner’s dashboard. Log in to the dashboard using the link in the confirmation email. Then follow the steps under “Transfer registration.” The buyer will then receive an email invitation to transfer the registration to their name.
- The seller pays €15, which is the same amount as the cancellation policy that could be ordered when registering.
- If you complete the transfer after March 15th, the name of the original owner will be printed on the
bib number. You will still be correctly entered in the results, and this participation will count towards becoming a Super Marathon Master. - The organization is not responsible for the financial transactions or their settlement between buyer and seller.
When collecting your starting number, you must identify yourself by showing physical identification (such as a passport, ID card, or driver’s license). You are permitted to collect someone else’s bib number by showing the physical identification of the owner of the bib number. Copies, photos, etc. are not permitted.
Can I transfer my bib number for the other distances?
You can transfer your starting number to someone else by logging in to your dashboard and following the steps. If you transfer your race entry after March 1st, your name will not be visible on the bib number, as it has already been printed.
€3 administration costs are charged for transferring the bib number, which must be paid by the buyer of the bib number in order to register the bib number to his/her name.
There is no official resale platform from the organization.
All information about participating as a fast runner at the NN Marathon Rotterdam can be found here.
View all information about the Super Marathon Masters here.
Super Marathon Masters can register between September 23 and March 22.
The NN Marathon Rotterdam was awarded the World Athletics Road Race Gold Label in 2025. This is an award from the International Athletics Federation.
event info
Is there an app?
An app will be updated in the run-up to the event. In this app:
- Can your friends/family follow you via the live-tracking function (we will update the full list of participants shortly before the event);
- Can you find all important information and receive event updates;
- Can you take selfies with our selfie filters.
How do I travel to the event?
We advise participants and spectators to travel by public transport or bicycle as much as possible. Please note that many roads are closed and the city is very busy. Click here for all travel info.
Are personal photos taken?
On the day of the event, various photographers will be present to capture atmosphere shots of the NN Marathon Rotterdam. These photos can be found in a Facebook album after the event.
Marathon Photos will also take photos at various points along the course and, of course, at the finish line, which you can view afterwards on your personal results page. Make sure your bib number is clearly visible and smile at the camera. You will receive the link to the photos by email after the event.
What happens to found objects?
Lost property is collected at the bag drop. Please contact us if your belongings are not here either. After the event we have a overview of all found objects.
Is there a changing facility and bag drop-off?
There will be no changing facilities or bag drop-off on Saturday, April 11. On Sunday, April 12, changing rooms and bag drop-off will only be available to participants of the NN Marathon Rotterdam who selected this option on the registration form (€5.50).
Changing facilities
Your bib number displays the changing facilities icon, which grants you access to the changing area. You will not be granted access without a bib number with this icon. Supporters are also not given access to the changing facilities.
The changing facilities for ladies and gentlemen are located in De Doelen via the entrance on Kruisplein (open from 8 a.m. to 5 p.m.). Leaving items in the changing facilities is not permitted, they will be removed.
There are no showers in the changing facilities.
Bag deposit
The bag deposit (open from 8:00 AM to 5:00 PM) is located in tents at Schouwburgplein. You can leave your bag (without valuables) here at your own risk. Please note: the maximum dimensions for bags are 30 (l) x 20 (w) x 50 (h).
Please note: If you have opted for bag drop-off during the NN Marathon Rotterdam, you will automatically purchase additional changing facilities.
Will I get a medal?
All participants will receive a medal after crossing the finish line as a reminder of the event. Furthermore, participants can have this medal engraved with their name and finishing time.
Participants in The Marathon Rotterdam Walk receive a walking pin.
Can I have my medal engraved?
All participants can have their medal engraved immediately afterwards. You can order ”medal engraving” for this in the registration form. If you didn’t do this immediately upon registration, you can still add it by logging in to your dashboard until March 1st. If you didn’t do this immediately upon registration, you can still add it by logging in to your dashboard until March 1st.
During the marathon weekend you can have your medal engraved at the following locations:
- Saturday: Schouwburgplein
- Sunday: in de Doelen (next to Schouwburgplein)
Where can I meet my supporters after the race?
On Sunday, April 12, we will place Meeting Point flags on Karel Doormanstraat. Decide in advance at which color flag you will meet your supporters after the race. The colors are: blue, red, yellow, and green.
Will there be pacers?
Yes, in collaboration with the Dutch Pacing Team, pacers will be present again at the upcoming edition to help runners achieve their target times in the marathon distance.
The Dutch Pacing Team consists of experienced runners who set the pace for the full marathon. The pacers wear flags and bib numbers with their pacing time. You can join a pacer of your choice.
Click here for all information.
Is there an awards ceremony?
At the NN Marathon Rotterdam, cash prizes are awarded to the top three men and women from category M35 and above. There are no age categories for the City Run and the 10 KM Rotterdam, only divisions into men and women. Prizes can be won at these distances.
Please note: the gun time is the official time. Every participant who reaches the finish line within the time limit receives a medal.
Can I take my backpack or camel bag into the start area?
We advise you to come to the start in running clothes. It is not permitted to take bags/backpacks into the start area (with the exception of camel bags) or to leave them unattended around the event site or course. Anything left unattended will be removed and discarded for safety reasons.
What are the time limits?
In connection with the program and the timely release of the route, we apply the following time limits.
- NN Marathon Rotterdam: 5 hours and 30 minutes (21.1 km within 2 hours and 45 minutes—you must pass the Erasmus Bridge towards the city center by 2:15 PM at the latest, 28 km within 3 hours and 40 minutes)
- 10 KM Rotterdam: 1 hour and 20 minutes (6 km within 50 minutes, 9 km within 1 hour and 10 minutes)
- City Run Rotterdam: 45 minutes
The time starts when the last runner crosses the starting line.
Participants who cross the finish line after the deadline will no longer be included in the race results and will not receive a medal.
The following time limits apply to The Marathon Rotterdam Walk:
- 15 km: maximum 5 hours
- 10 km: maximum 3,5 hours
- 5 km: maximum 2 hours
The time starts when the last runner crosses the starting line.
The time table for the marathon distance is:
| first runner | last runner | ||
| Distance | Street | wave 1 | wave 5 |
| Start | Schiedamsedijk | 10:00:00 | 10:36:00 |
| Kilometer 1 | Laan op zuid | 10:02:56 | 10:44:18 |
| Kilometer 2 | Laan op zuid | 10:05:53 | 10:52:35 |
| Kilometer 3 | Stadionweg | 10:08:49 | 11:00:53 |
| Kilometer 4 | Stadionweg | 10:11:45 | 11:09:11 |
| Kilometer 5 | Adriaan Volkerlaan | 10:14:42 | 11:17:28 |
| Kilometer 6 | Olympiaweg | 10:17:38 | 11:25:46 |
| Kilometer 7 | Smeetslandseweg | 10:20:34 | 11:34:04 |
| Kilometer 8 | Spinozaweg | 10:23:31 | 11:42:22 |
| Kilometer 9 | Havenspoorpad | 10:26:27 | 11:50:39 |
| Kilometer 10 | Havenspoorpad | 10:29:23 | 11:58:57 |
| Kilometer 11 | Havenspoorpad | 10:32:20 | 12:07:15 |
| Kilometer 12 | Havenspoorpad | 10:35:16 | 12:15:32 |
| Kilometer 13 | Zuiderparkweg | 10:38:12 | 12:23:50 |
| Kilometer 14 | Slinge | 10:41:09 | 12:32:08 |
| Kilometer 15 | Slinge | 10:44:05 | 12:40:25 |
| Kilometer 16 | Oldegaarde | 10:47:01 | 12:48:43 |
| Kilometer 17 | Oldegaarde | 10:49:58 | 12:57:01 |
| Kilometer 18 | Vaanweg | 10:52:54 | 13:05:18 |
| Kilometer 19 | Zuiderparkweg | 10:55:50 | 13:13:36 |
| Kilometer 20 | Oldegaarde | 10:58:46 | 13:21:54 |
| Kilometer 21 | Dorpsweg | 11:01:43 | 13:30:11 |
| Kilometer 22 | Brielselaan | 11:04:39 | 13:38:29 |
| Kilometer 23 | Brielselaan | 11:07:35 | 13:46:47 |
| Kilometer 24 | Putselaan | 11:10:32 | 13:55:05 |
| Kilometer 25 | Laan op zuid | 11:13:28 | 14:03:22 |
| Kilometer 26 | Laan op zuid | 11:16:24 | 14:11:40 |
| Kilometer 27 | Erasmusbrug | 11:19:21 | 14:19:58 |
| Kilometer 28 | Westblaak | 11:22:17 | 14:28:15 |
| Kilometer 29 | Overblaak | 11:25:13 | 14:36:33 |
| Kilometer 30 | Warande | 11:28:10 | 14:44:51 |
| Kilometer 31 | Boezemstraat | 11:31:06 | 14:53:08 |
| Kilometer 32 | Bosdreef | 11:34:02 | 15:01:26 |
| Kilometer 33 | Bosdreef | 11:36:59 | 15:09:44 |
| Kilometer 34 | Boszoom | 11:39:55 | 15:18:01 |
| Kilometer 35 | Boszoom | 11:42:51 | 15:26:19 |
| Kilometer 36 | Kralingseweg | 11:45:48 | 15:34:37 |
| Kilometer 37 | Kralingse Plaslaan | 11:48:44 | 15:42:55 |
| Kilometer 38 | Kralingse Plaslaan | 11:51:40 | 15:51:12 |
| Kilometer 39 | Boezemstraat | 11:54:37 | 15:59:30 |
| Kilometer 40 | Warande | 11:57:33 | 16:07:48 |
| Kilometer 41 | Overblaak | 12:00:29 | 16:16:05 |
| Kilometer 42 | Coolsingel | 12:03:26 | 16:24:23 |
| Coolsingel | Coolsingel | 12:04:00 | 16:26:00 |
Is there time registration?
Your time will be recorded at the NN Marathon, 10 KM Rotterdam, City Run, and NN Kids Runs. An electronic chip is located on the back of your bib number . Draag je startnummer correct om je tijd geregistreerd te krijgen.
Information to ensure good time registration:
- Wear your starting number visibly on your chest. Do not cover the bib number with a jacket or with your hands while passing the mats at the start and finish line. These mats pick up the signal from your chip (Also be careful when pressing your own stopwatch at the start and finish line).
- Do not fold or wrinkle the bib number. Certainly not where the chip is.
- Use four pins on the corners of the bib number, do not drill through the chip.
- Do not remove the plastic spacer.
You can keep the bib number as a souvenir or throw it away with the normal waste (plastic).
What is the official time?
The gun time is the official time. Deze start op het moment dat het startschot gegeven wordt en stopt op het moment dat je de finish passeert. The net time is the time that starts when you cross the mat on the starting line and stops when you cross the finish line. The net time/chip time is stated as an extra service.
Where are the toilets located?
Toilets can be found at the changing facilities, the start, the finish, every 2.5 km along the course and at the change points of the Business Runs.
Where can I find my results?
The results will be published on our website afterwards. You will also receive the link to the results page by email after the event. Please note: the gun time is the official time. Do you have a question or comment about your result? Please send an email to ChronoRace, stating your bib number and any times you may have clocked yourself.
Which aid stations are there along the course?
See below which refreshments are provided for each distance.
Keep the packaging of gels and similar items with you and do not throw them on the street. Dispose of packaging and empty cups in the designated bins, which can be found at the refreshment stations and after the fin nish. Together we keep the city clean!
NN Marathon Rotterdam
During the NN Marathon Rotterdam, refreshment stations will be set up with cups of water and AA Drink-Iso Lemon (isotonic sports drink) (in cups, diluted, approximately 8 carbohydrates per 100 ml) (5 km, 10 km, 15 km, 20 km, 25 km, 30 km, 35 km, and 40 km). Tea will be available at the 25 km mark. Bananas are available at 20 km and Upfront gel at 34 km. In addition, sponge stations are provided (12.5 km, 17.5 km, 22.5 km, 27.5 km, 32.5 km and 37.5 km).
Water, AA Drink-Iso Lemon and tea will also be available immediately after the finish. We advise all runners to use the aid stations as you are used to during your preparation.
10 KM Rotterdam
During the 10 KM Rotterdam, there will be a refreshment station with cups of water and AA Drink-Iso Lemon (isotonic sports drink) (in cups, diluted, approximately 8 carbohydrates per 100 ml) at the 5 km mark. Water, AA Drink-Iso Lemon and bananas are also available immediately after the finish.
City Run Rotterdam
At 2 km there is a water post. Immediately after the finish, each participant receives a cup of water and a bottle of AA Drink-Iso Lemon.
NN Kids Runs
Immediately after the finish, each participant will receive a cup of water and a bottle of AA Drink-Iso Lemon.
Safe and responsible running
Not replenishing fluid loss from sweating during endurance sports can lead to a decrease in performance. Inadequate drinking can eventually lead to medical problems. Many athletes don’t seem to know that not only drinking too little but also too much can endanger their health. Maintaining proper levels of fluids and salts in the body is extremely important.
When you go on the road as an athlete, the body loses both fluid and salts through body sweat on the skin and through breathing. Processes that ensure that you get the cooling you need to keep your body temperature stable. Failure to replenish the loss of body fluid in a timely manner and in the correct quantities can lead to dehydration (due to drinking too little) and hyponatremia (a shortage of salts due to drinking too much). This can affect your performance, your psychological and your physical state. Replenishing fluids and salts to optimal levels is highly individual and depends on environmental conditions (weather), type and intensity of physical activity (speed) and personal factors such as level of fitness, body weight and the clothing you wear.
Athletes have their own responsibility in this. Drinking the right amounts is a combination of knowing your physical needs and the way you drink while walking.
Good preparation is very important to participate responsibly in the NN Marathon Rotterdam. In addition, it is important that you listen carefully to your body during and after your running performance. Read all the advice on this page that will help you to enjoy the NN Marathon Rotterdam well prepared.