check for a shoulder impingement, or a labral/rotator cuff tear
Softball skills will be needing the abductor and adductor muscles of the leg, The core muscles is important for rotational movement (batting, throwing). Lats and tricep musles for overhead throw, deltoids for pitching, and forearm for grips
I think what your after is called an antagonistic pair of muscles, for example the bicep and the tricep. When the bicep is contracting the tricep relaxes and when the tricep is contracting the bicep relaxes.
There are two main ones, the tricep and the biscep. The tricep bicep is on the inside angle as defined by your elbow, the tricep is on the outside.
The tricep muscle is mainly responsible for the straightening of the arm. This means that the tricep muscles are voluntary, and will only move if we wish to move our arms.
Muscles can only pull not push. That is why they work in pairs an example is your tricep and bicep, your bicep pulls your arm up and your tricep pulls your arm down.
Your pectoral muscle allows you to do a push up. When you do a push up you use your pectoral muscle, your tricep muscle, and you use your shoulder back at the rotator cuff.
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Chest, tricep, shoulder, possibly hips (if jabber turns waist to put more power into it), possibly quadricep of rear leg (if jabber pushes off of back leg).
Tricep brachii is responsible for extension (straightening) of the arm at the elbow. There are 3 heads of the Tricep; the long, lateral and medial heads. The Tricep is an antagonist of the bicep and brachialis muscles of the upper arm, which both assist in flexion at the elbow joint.
The muscles are moving antagonistically.