In just 108 days, I’m aiming to run my first 100K ultra marathon – in the mountains. But today, I’m testing something completely different: speed.

My current 5K PR is 19:42, so breaking 40 minutes in the 10K is going to be a serious challenge. Can I hold the pace? Can I push through? This is a key test on my road to building both speed and endurance for the big day.

My 4-Hour Race Simulation:    • Training for a 100K by Running a 48-meter-...  
Jeroen's channel:    / @fit_nl  

Timestamps:
00:00 Intro
00:21 108 Days Out
01:09 The 10K Race
02:15 Halfway (5K)
03:02 Last K
03:27 Aftermath
04:16 Race Recap
05:10 Upcoming Plans

👉 Follow the journey as I train for distance, climb, and mental grit — one run at a time.

#10K #ultramarathon #roadto100k #runningchallenge #mountainultra #break40