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Tricep flexes and bicep relaxes when the forearm is extended
I believe triceps
The posterior deltoid is one extensor of the upper arm.
the shoulder muscle extends the arm
Triceps
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 Neck Muscle
Latissimus dorsi is the muscle that extends from the ribs to the pubis and compresses the abdomen.
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.
There is not a single muscle that rotates the upper arm. The name of the muscle that contributes in rotation of the upper arm is deltoid muscle.