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A 15-minute, four-exercise circuit. Between burpees on the TRX for 30 seconds and double-unders (two rotations of the rope in one jump) the first half of this circuit will set a grueling pace. You’ll hit your lower body with squats and then fry your upper body and core with bear crawls.
You won’t find any isolation movements in this circuit, since each exercise targets just about every muscle and the 30-second duration will have you (and the floor) doused with sweat. While 15 minutes doesn’t sound like a lot of time, this workout will have your body burning more calories than traditional cardio…that is, if you can make it all the way through.