• Pick any cardio you like (running, swimming, the elliptical trainer). Warm up for 2 minutes at a moderate pace, then sprint for 30 seconds at the highest intensity you can muster. Slow down and do 90 seconds at a catch-your-breath recovery pace. Repeat eight times. You'll torch more calories in less time, while you burn fat faster. Follow this cardio session with a few of the following fast firmers for a total-body workout in less than 30 minutes.
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