Fiesta...road bike...2 sets of 5x(1’on2’off) 10’ RBI. Brutal. It was supposed to be 3 sets but I decided to test (me) with two versus three sets to see how I felt/recovered. The second set was better than the first. My Garmin 820 always gives me a recovery estimate. The highest I have ever got was 44 hours and today was 37 hours. Another set would have set would have meant I did 15, one minute, all out efforts and probably a new high water mark for required recovery.