02/03/2026
PSA for Pitchers: “Arm Side” / “Glove Side” Is Wrong
There’s no true “arm side” or “glove side” movement.
Throwing doesn’t start in the arm.
It starts in the core, and flows through the spine.
It’s simple:
• The core drives the arm through the spine and trunk
• The arm follows — it doesn’t lead
• Power moves from center → out
Your nervous system creates movement through the spine, then the arm just delivers it.
When you think “arm side” or “glove side,” you:
• Lose core control
• Create compensations
• Stress the shoulder and elbow
• Leak velocity
You don’t throw with your arm.
You throw through your arm using your core, spine, and trunk.
That’s not theory — that’s how the body is built to move.
Spine first.
Arm last.
Every time.