Ugh, how many times do you go over under in each 20 minute interval? Do you do it by levels, hr, or watts? I know these are good, and I've done them a couple of times, but they're very hard.
I'm doing them at 2min over, 2min under FTP - working off wattage. They're definitely hard.
Yes! But helpful for later! I'm sorry, what is FTP?
Sure - FTP is functional threshold power, or the average wattage you can hold for approximately one hour. Lots of info out there on how to determine what your FTP is, e.g., http://alex-cycle.blogspot.com/2008/05/the-seven-deadly-sins.html
Thanks! Thought it was something about a threshold.
I think that's how I had done them last year. Basically you're time trialing and then going all out, but recovering at your TT pace. Ugh.