Doing each of these workouts at high intensity for 30 seconds will really burn those calories. If you have more time, repeat this circuit two or three times for an effective cardio and strength-training workout. Learn how to do each exercise here, and print out the seven-minute HIIT workout here. You'll need to be by a wall (or tree) as well as a step or ledge for the workout.
7-Minute High-Intensity Workout
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