I figured someone would call BS. Fair enough, it really is hard to get used to. Here's a link to the study by Gross and colleagues where skiers did 850 +/-70w for 20min. Its strength training not endurance.
www.researchgate.net/profile/Micah_Gross/publication/44594167_Effects_of_Eccentric_Cycle_Ergometry_in_Alpine_Skiers/links/0deec529f22a193ebc000000.pdf