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The reason we know Niels van der Poel's training in such detail is because he wrote a manifesto about it, "How to Skate a 10k", when he retired (after winning gold and setting the WR). He did his base aerobic phase primarily on bicycle, writing:

> My target developed during the summer of 2021 to reach 33h of cycling weekly. I would aim to do three 7h bike rides and two 6h rides. If I would’ve been able to run, which I wasn’t due to injury, I would have lowered the hours a little and settled for 25h weekly (or approx. 30h if I would’ve combined running and cycling).

33h at 240 watts, about 28k calories/week!

It is a fascinating read for anyone interested in endurance sports, highly recommended: https://www.howtoskate.se/