Nils van der Poel was* a long distance speed skater who set impressive records and wrote about his training regime. His book is https://www.howtoskate.se/. He trained ambitiously for 3 years, won Olympic gold medals and retired! He followed a very analytically minded path and avoided overtraining.

See also brief overview article about him:

https://runningmagazine.ca/sections/training/olympic-speed-s...

(*) He changed his name since, to a more common name, so using past tense seemed humorously appropriate.