De VolgendeRonde
Every hour. 5 km. Finish together.
May 29-30, 2026 · CrossFit Leiden
Running together for the Bas van de Goor Foundation
What is De Volgende Ronde?
De Volgende Ronde is a Backyard Ultra-style running event. Every hour a new 5-kilometer round starts. You run as long as you can — or until the final round at 15:00.
The best part: you choose how big your challenge will be.
Running together for the
Bas van de Goor Foundation
Of each €15 registration fee, €7 goes toward your personal patch and €8 is donated to the Bas van de Goor Foundation. This foundation supports children with type 1 diabetes — so they can exercise and play without worry.
💛 Why this event
Rick, one of our most loyal members, has type 1 diabetes himself. Every year he raises sponsorship money for the Bas van de Goor Foundation. This year, we as the CrossFit Leiden community want to use this great event to support Rick in that mission. Together we can make a difference.
€15 registration
€7 for your personal patch · €8 donated to the foundation
Choose your challenge
One round or twenty — every finish is an achievement
Explorer
1 – 7 rounds
Join during the day. 1-6 rounds. Perfect for your first time.
Grinder
8 – 17 rounds
Join after midnight. 10-16 rounds. A serious challenge in the dark hours.
Full Send
17 – 20 rounds
Start at 20:00. All 20 rounds. 100 km in 20 hours. The ultimate challenge.
How does it work?
A new round every hour
On the hour, every hour, the starting signal sounds. You have 60 minutes to run 5 km.
Late = out
Late = you're out. Not just that round, not the next one either. Game over.
Choose your start time
Start at 20:00 for all 20 rounds, or join later for fewer rounds.
Finish together
At 15:00 it's the final round. We finish together as a team.
20:00
First round
15:00
Last round
5 km
Per round
20
Max rounds
CFL & Cronesteyn
Location
The Patch System
At the start, your personal patch hangs on the wall in the gym. As long as you're running, it stays there. So everyone can see how many runners are still going.
Have to stop? Your patch comes down — and you get to keep it as a memento. A tangible reminder of your challenge.
The patch is funded from your registration fee (€7). The rest (€8) goes to the Bas van de Goor Foundation.
Who is it for?
This event is for anyone who loves a challenge. No ultra-running experience needed.
Busy parent wanting to do something for themselves
Professional looking for a mental challenge
Someone who wants to experience something special together
Sign up
Open to members, former members and friends of CrossFit Leiden. Registration = €15 donation. Fill in your details and choose your start time.
⚠️ This event can only take place with enough volunteers. Sign up as a volunteer too!
Participants
No registrations yet. Be the first!
The first registrations will appear here once they come in.
Become a volunteer 🙌
⚠️ This event can only take place with enough volunteers!
We need at least 4-6 volunteers per hour. No volunteers = no event. Help make this happen!
Choose which hours you're available and where you want to help. You don't have to be there the entire event — every hour counts!
Start & Finish
Get runners started on time, check-in, time registration
Min. 1 per hour
Route
Stand along the route, make sure everything goes safely
Min. 1 (night) / 3 (daytime)
Aid station
Prepare snacks, water and energy drinks for runners
Min. 2 per hour
General
Setup, cleanup, create atmosphere — we'll see where you're needed
Min. always welcome
Practical info
📅 When
Friday May 29 20:00 — Saturday May 30 16:00
First round: 20:00 · Last round: 15:00
📍 Where
CrossFit Leiden
Marie Diebenplaats 108, 2324 NG Leiden
🛣️ The route
Each round is 5 km through Park Cronesteyn — a beautiful loop through Leiden's nature. Start and finish at CrossFit Leiden.
🌙 During the dark hours at night we run 10 rounds on our own running track at the gym.
⚠️ Rules
- • Be in the starting area 1 minute before the hour
- • Late = you're out. Not that round, not the next. Game over.
- • Open to members, former members and friends of CrossFit Leiden
Finish together
The power of De Volgende Ronde is finishing together. At 15:00 we start the last round. We gather at the gym, grab a drink, take a group photo and celebrate every round you completed.
Everyone receives a unique patch as a keepsake — regardless of how many rounds you ran.
Join — Sign up now