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For many people, that approach would be absolutely fine—but everyone is different. For my current shoulder workout, I do two exercises for the front, rear, and side delts, and two for traps. But I change the format each week by varying tempo, weight, and rest periods. I also incorporate dropsets, supersets, and rest-pause sets to push my muscles to failure and beyond. Constantly changing my workouts keeps the muscle guessing. It also means I don’t get bored.