Stance

The batter is standing in the batters box in the loading phase (bat back, feet shoulder width apart, with feet facing home plate).

Scapulothoracic elevation by the levator scapulae, rhomboids and the middle fibers of the trapezius.

Abduction of the levator scapulae, rhomboids and the middle fibers of the trapezius working concentrically with the supraspinatus, deltoid, and upper pectoralis major to raise the shoudlers in the frontal plane in the anterioposterior axis of rotation.

Scapulothoracic retraction (adduction) by the rhomboids and the middle/lower fibers of the trapezius.
Flexion of the rhomboids and the middle/lower fibers of the trapezius working eccentrically with the anterior deltoid and upper pectoralis major to bring the shoulders back.

Humeroulna flexion by the biceps brachi short and long heads, brachialis, brachioradialis and pronator teres in the transverse plane around the mediolateral axis of rotation working concentrically.

Humeroulna abduction by the biceps brachii short and long heads in the frontal plane in the mediolateral axis of rotation working concentrically.

Radiounlar pronation of the dexter and sinister arms by the pronator teres and pronator quadratus in the transverse plane along the vertical axis of rotation working concentrically.

Abduction of the acetabularfemoral joint to shoulder length apart by the gluteus medius, gluteus minimus and the tensor fasciae latae in the frontal plane along the anteroposterior axis working isometrically.

Slight sinister and dexter flexion of the tibiofemural joint by the biceps femoris, popliteus, semi-membranosus and semi-tendinosus in the sagittal plane in the mediolateral axis of rotation working concentrically.