During the week you should do 3 days of solid FTP intervals (91-105% of your FTP). Start doing 40 to 60 minute each day and raise gradually to 60 to 90 minute. Try to get the 90 minute threshold workout on Saturday during your group ride and really go deep. Try to be rested between sessions in order to maximize the benefits of FTP work. Feb 18, 2016 · Threshold Power grows from FTP, a concept refined by power authority, Dr. Andy Coggan, is an estimation of the amount of work you are able to do in an hour. It serves as the basis for loads of other important metrics (e.g. TSS , CTL, ATL, TSB , etc.) that will be covered in future entries.