1. Triceps and Biceps Diamond push-ups focus mainly on the triceps brachii (aka your triceps), the muscle that runs along the back of your upper arm, according toCarolina Araujo, CPT, a New York-based strength coach. Your triceps work with your biceps on the front of your upper arm to...
Push on the floor concentrating on pushing with your triceps and not your shoulders or chest as you exhale until your arms are straight. Hold and then repeat step 3. You can also do what I call pigeon-toed pushups as an alternative. To do these turn your wrists and arms until your fin...