Teh MATHS gives a formula of 1.7*ftp + weight in kg / 2.2 for 170% of v02 max power
TW.
Definitely consider 40/20. Less stress on the old body, and With better gains I reckon.
Plus. Dont take training advice from anyone that is mental enough to sit on a turbo for 10 hours.
@Smallfurry started
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Teh MATHS gives a formula of 1.7*ftp + weight in kg / 2.2 for 170% of v02 max power