Weighted Diamond Push-Up

Bring your hands together under your chest so your thumbs and index fingers touch, forming a small diamond. That narrow base puts almost all the work on your triceps rather than your chest. Keep your elbows tracking back along your sides as you lower, not out to the sides -- flaring turns this back into a normal push-up. Lower until your chest nearly touches your hands, then press through your palms to straighten your arms fully. The narrow base makes balance harder under load, so keep your core tight and your body in one line from shoulders to heels.