Muscles Used While Leging

Muscles used while pitching:
Leg:
The gluteus maximus and hamstrings, the quadriceps and the calves, the hip and knee are used to generate momentum, allowing t the ball to project more velocity.

Arm:
The throwing motion requires contributions from the deltoid and rotator cuff muscles of the throwing shoulder, the triceps and anconeus muscles of the upper arm and numerous muscles within the throwing forearm.
Back muscle: A variety of muscles within the upper back, including the rhomboids and trapezius. muscles, also help move the scapula bones, allowing for a full range of motion when swinging and throwing. The latissimus dorsi muscle, which spans the sides of the back, also contributes to the overhand throwing motion.