Cut Your Workout Time in Half

Metabolism-Boosting Workout

These multitasking moves tone multiple muscle groups simultaneously so you can turn up the burn on your metabolism in minutes. Do 2 or 3 sets of 8 to 10 reps of each move 2 times a week. Use a weight that's heavy enough so that when you get to your last rep, you wouldn't be able to complete additional reps with proper form.