Relative Strength Index (RSI) Calculator

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Evaluate jump power and reactive capacity based on jump height and ground contact time.

Jump Height (cm)

Ground Contact Time (seconds)

Understanding the Stretch-Shortening Cycle (SSC)

The **Reactive Strength Index (RSI)** is a plyometric assessment metric. It evaluates an athlete's ability to rapidly transition from an eccentric contraction (landing/absorbing force) to a concentric contraction (takeoff/generating force). High RSI indicators point to optimal nervous system firing and Achilles tendon spring capacity.

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Typically measured using force plates, contact mats, or video analysis software.

Incorporate progressive plyometrics like depth jumps, hurdle bounds, and explosive calf loading.