This chest workout consists of only one exercise—the pushup—but it’s hard as hell. That’s because it uses varying tempos to cumulatively challenge the same muscle groups, says Men’s Health Fitness Director BJ Gaddour. First, you’ll go as fast as possible,
How to Do: Stand with feet hip- to shoulder-width apart, holding a relatively light barbell across your upper traps. Keeping your back flat and knees slightly bent, slowly bend your hips back to lower your torso toward the floor.