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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 muscle that is commonly described as an inverted triangle shape on the back is the latissimus dorsi. This large, flat muscle extends from the lower back to the upper arm and is responsible for various movements, including arm extension, adduction, and internal rotation. Its shape contributes to the V-taper appearance in the torso, making it an important muscle for athletes and fitness enthusiasts.
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.
The muscles of the hand are as listed below:abductor pollicis brevisflexor pollicis brevisopponens pollicisabductor digiti minimiflexor digiti minimiopponens digiti minimidigitorum profunduspalmer interosseidorsal interosseiflexor retinaculumpalmer aponeurosiflexor digitorum superficialisThese muscles along with many tendons help to control the hand and are broken down into different groups of muscles.