Ariel_yu on Instagram: "The push-up is a compound, multi-joint movement. It doesn‘t just work your chest - it also targets the anterior deltoids and triceps. While the chest muscles are the primary focus, your shoulders and arms play a major role in the movement. To perform push-ups with proper form and get the most benefit, here are 4 key details you need to focus on: 1. Elbow angle & hand position Keep elbows at about a 45° angle by externally rotating your shoulders. Spread your fingers for b