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The one-minute workout
(ten minutes total) Warm up for two minutes on a treadmill, on a stationary bike or by jogging in place. Go all-out for 20 seconds, then slow down and keep going for two minutes. Repeat two more times and cool down for three minutes.
The simple two-minute workout
(20 minutes total) Warm up for two minutes, as in the one-minute workout.
Pick any combination of lunges, squats, jumping jacks, pushups, running in place, side leg kicks, donkey kicks, burpees, sit-ups or your favorite aerobic move. Choose six and do each one for 20 seconds. Rest between each move by walking in place or pedaling slowly for two minutes. Cool down for three minutes.