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Deep dives on the science and the world of ultra endurance sports, by UESCA certified coach Jonathan Fors.

Latest posts

You can't get fitter this week

Sep 22, 2026

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3 min read

You can't get fitter this week

But you can easily throw months of training away in the final 7 days.

Jonathan Fors
Jonathan Fors
is it really that extreme though?

Sep 18, 2026

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3 min read

is it really that extreme though?

Why running 100 miles or tracking biomarkers looks crazy to a culture that sits all day

Jonathan Fors
Jonathan Fors
Bryan Johnson vs the 100-miler

Sep 15, 2026

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3 min read

Bryan Johnson vs the 100-miler

Preserving a body in a lab vs building one that can take a beating

Jonathan Fors
Jonathan Fors
from 0 to 60 km weeks

Sep 13, 2026

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4 min read

from 0 to 60 km weeks

we've all been there... with the injury

Jonathan Fors
Jonathan Fors
quick bend, and let's go... right?

Sep 11, 2026

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3 min read

quick bend, and let's go... right?

when warming up actually matters

Jonathan Fors
Jonathan Fors
Stretching isn't a warm-up

Sep 8, 2026

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3 min read

Stretching isn't a warm-up

It has one job, and preventing injuries isn't it

Jonathan Fors
Jonathan Fors