Rennen Tegen Kanker - TCS Amsterdam Marathon 2026
Ik ren omdat kanker bijna iedereen raakt, dichterbij of verder weg. Daarom wil ik ter voorbereiding op de marathon 1.000 kilometer rennen in <50 dagen wat neerkomt op gemiddeld 20 kilometer per dag en daarmee >€1.000 ophalen om zo iets bij te dragen aan een beter leven met en ná kanker.
Door mij te sponsoren help je KWF aan meer onderzoek, betere behandelingen en meer hoop. Samen maken we het verschil!
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Mijn updates
DAY 16
Sunday 16th Aug 2026@jellegriff Day 16 of running a 1.000 KM 🔥 #marathon #training #ultra #running #target
♬ origineel geluid - Jelle Griffioen
DAY 15
Sunday 16th Aug 2026@jellegriff Day 15 of running a 1.000 KM 🔥 #marathon #training #ultra #running #switzerland🇨🇭
♬ origineel geluid - Jelle Griffioen
DAY 14
Saturday 15th Aug 2026@jellegriff Day 14 of running a 1.000 KM 🔥 #marathon #training #ultra #running #mountain
♬ origineel geluid - Jelle Griffioen
DAY 12
Saturday 15th Aug 2026@jellegriff Day 13 of running a 1.000 KM 🔥 #marathon #training #ultra #running #recovery
♬ Magnetic - The Bausa
DAY 12
Saturday 15th Aug 2026@jellegriff Day 12 of running a 1.000 KM 🔥 NY Recap #marathon #training #ultra #running #challenge
♬ origineel geluid - Jelle Griffioen
DAY 11
Saturday 15th Aug 2026@jellegriff Day 11 of running a 1.000 KM 🔥 #marathon #training #ultra #running #stairs
♬ origineel geluid - Jelle Griffioen
DAY 10
Saturday 15th Aug 2026@jellegriff Day 10 of running a 1.000 KM 🔥 #marathon #training #ultra #running #motivation
♬ origineel geluid - Jelle Griffioen
DAY 9
Saturday 15th Aug 2026@jellegriff Day 9 of running a 1.000 KM 🔥 #marathon #training #ultra #running #motivation
♬ origineel geluid - Jelle Griffioen
DAY 8
Saturday 15th Aug 2026@jellegriff Day 8 of running a 1.000 KM 🔥 #marathon #training #ultra #running #kwf @Run with Jits @sundayrunclub @HOKA
♬ origineel geluid - Jelle Griffioen
DAY 7
Saturday 15th Aug 2026@jellegriff Day 7: I am currently running 1.000 km in 50 days, averaging about 20 km every day. To avoid injuries such as runner’s knee with this kind of volume, these are the tips that actually help me: 1. Strengthen your hips, not just your legs. Weak glutes are one of the biggest causes of runner’s knee. Simple side leg lifts or single-leg work a few times a week can make a real difference. 2. Increase your cadence. Shorten your stride and take slightly quicker steps. A higher cadence reduces the impact on your knees with every stride. 3. Run as quietly as possible. A soft, quiet landing usually means better form and less force going through your knees. 4. Add some single-leg balance work. Stand on one leg for 20–30 seconds after your run. It builds the stability your knees need with every step. 5. Keep easy days truly easy. If you cannot hold a conversation, you are probably pushing too hard. Most knee issues start when the easy runs stop being easy. Save these tips for later. They might be helpful when the volume starts adding up. #running #runnersknee #injuryprevention #endurancetraining #hybridathlete
♬ origineel geluid - Jelle Griffioen
DAY 6
Saturday 15th Aug 2026@jellegriff Day 6 of running a 1.000 KM 🔥 #marathon #training #ultrarunning #tcsamsterdammarathon #running
♬ origineel geluid - Jelle Griffioen
DAY 5
Wednesday 5th Aug 2026@jellegriff Day 4 of running a 1.000 KM 🔥 #marathon #kwf #running #hoka #cancer
♬ origineel geluid - Jelle Griffioen
DAY 3
Monday 3rd Aug 2026@jellegriff Day 3 of running a 1.000 KM 🔥 #marathon #kwf #tcsamsterdammarathon #ultra #running
♬ origineel geluid - Jelle Griffioen
DAY 2
Sunday 2nd Aug 2026@jellegriff Day 2 of running a 1.000 KM 🔥 #running #marathon #ultrarunning #hoka @HOKA #tcsamsterdammarathon
♬ origineel geluid - Jelle Griffioen
DAY 2
Sunday 2nd Aug 2026@jellegriff Day 2 of running a 1.000 KM 🔥 #running #marathon #ultrarunning #hoka @HOKA #tcsamsterdammarathon
♬ origineel geluid - Jelle Griffioen
DAY 1
Sunday 2nd Aug 2026@jellegriff Day 1 of running a 1.000KM 🔥 #running #marathon #ultrarunning #training #tcsamsterdammarathon
♬ origineel geluid - Jelle Griffioen
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