The concentric phase is the contraction and shortening of the muscles required to perform the movement. Not only are the muscles shortening to produce movement, the tendons (after being stretched) are returning to their normal length.  This adds a massive amount of force behind your momentum.  Remember, the concentric phase is crucial for explosive power in most sports.

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RUBBER BAND: this would be the release of the stretch.

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THE VERTICAL JUMP:  this would be the upward movement in the jump.

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THE HITTER'S BOTTOM HALF: this would be when the batter enters their body weight shift at toe touch.

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LET'S TAKE THE HITTER'S CORE: this would be the release of the batter's core on rotation.

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LET'S TAKE THE HITTER'S TOP HALF: this would be the shoulder muscles, arm muscles, and upper extremity release breaking for contact.