Peloton's fitness test involves either two 8-minute all-out efforts or one 20-minute all-out effort to determine functional threshold power.

“if you go into the Peloton there's called there's something called I think it's called fitness test and it's going to have you do either two eight minute all outs separated by some rest I forget how much or 120 minute all out I prefer the 20 minute all out I think it's a better test it will take your average wattage over 20 minutes it will multiply it by 0.9 and it will say that is your functional threshold power which is defined as the maximum power you can hold for one hour”