Today I did Sharon's Zero to Sixty, Zero to 26 combos. I have not don't that mix yet. It includes the w/u, abs, and Str with combos not broken down. 26 minutes, 124 calories. I then did STS disc 19 Chest, Shoulders, and Triceps, 69 minutes 267 calories. Total time 95 minutes, calories burned 391. I felt I worked much harder than that silly HR monitor said. I am kind of wondering if the battery needs changed since it is sporadic on how it picks up the HR. It has been a year and a half since I sent it out have the battery changed. It is not one of the ones that you can do yourself.