Throwing Mechanics

Why Mechanics Matter — Injury Prevention First

The #1 cause of youth arm injuries is poor throwing mechanics — not overuse alone. A player who throws 30 balls with incorrect mechanics does more damage than one who throws 60 with correct form.

Coaches at every level are responsible for identifying and correcting mechanical issues early. This guide gives you the checkpoints to use in warm-up and drill observation.

The Four-Seam Grip

All youth players should start with a four-seam grip for accuracy and arm health. Two fingers across the widest seams, thumb underneath, ring and pinky finger on the side of the ball.

• Index and middle finger across the four seams at the widest point
• Thumb directly underneath — not on the side
• Fingers relaxed, not white-knuckled — you should be able to pull the ball out of their grip
• Ball rests in the fingertips, not the palm — check: can you see a gap between the ball and their hand?

Throwing Motion — Step-by-Step Checkpoints

Use these checkpoints when observing your players during warm-up. Address one checkpoint per player per practice — don't overwhelm them with multiple corrections at once.

• Step 1 — Grip: four-seam, fingertip contact, relaxed hand
• Step 2 — Athletic starting position: weight evenly distributed, ball at chest
• Step 3 — Separation: hands separate as the stride foot moves toward the target
• Step 4 — "L" position: throwing arm makes an L shape at shoulder height — elbow at or above shoulder, forearm pointing up
• Step 5 — Stride: long stride toward the target, front foot lands pointed at target (or within 30°)
• Step 6 — Hip rotation: hips open before the arm throws — the arm follows the hips
• Step 7 — Release: ball released out in front at a 12 o'clock position for a four-seam fastball
• Step 8 — Follow-through: throwing arm finishes across the body toward the opposite hip. "Zip the jacket."

Long Toss Protocol by Age

Long toss builds arm strength, but the protocol should match the age and physical development of the player. More distance is not always better for young arms.

• 6U–8U: Maximum 35–40 feet. Keep it flat and conversational. No arc throws.
• 10U: Build to 60–70 feet. Gradual increase week over week during the season.
• 11U–12U: 80–100 feet after a proper warm-up at shorter distance.
• 13U–14U: 100–120+ feet with intent. Arc throws acceptable once arm is warm.
• Rule: always work back in before finishing — final throws should be at 45 feet.

Throwing Mechanics

Step-by-step guide to proper throwing form for each age level. Reduce arm injuries.

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