The Cardio Load calculation ... This is why your 30-minute workout might count for 45 zone minutes, if 15 of those minutes were moderate and 15 were vigorous (15 x 2 = 30).

With its ultra-intense format, TABATA requires a strong aerobic base but ... What you need: This workout requires an elliptical machine and 30–45 minutes of uninterrupted time.

This comprehensive program will guide you through each exercise activity you’ll do over the next four to six weeks, with strength training and cardio workouts lasting between 20 and 43 minutes.