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The posterior deltoid is one extensor of the upper arm.
the shoulder muscle extends the arm
The biceps muscle relaxes!!!!!=)
-Flexion of the Arm -Flexion of the Forearm-Supination of the Forearm-Stabilization of the glenohumeral joint
The triceps is a muscle in the upper arm that extends the elbow. It has no direct relationship to the knee.
the anterior part of the deltoid muscle flexes and medially rotates the humerus/ the arm. to do this it is helped by muscles like coracobrachialis and pectoralis major, corachobrachialis also adduct and flex the arm at shoulder joint.
Pectorals and Triceps are the most important. Depends on the style of pushup
The triceps brachii muscle is located on the upper back half of the arm and is responsible for extending the forearm. It has three heads (hence the name "triceps") that converge to form the tendon that attaches to the elbow joint.
one competitor of the perfect pushup is the pushup pro but the perfect pushup is much smoother and can hold up more weight than the pushup pro.
The Neck Muscle
The trapezius muscle extends from the upper back to the back of the neck. Its main functions are to support the arm and to move the shoulder blade.
trapezius muscle