Fitness
Reactive Strength Index
Reactive strength index scores how fast you rebound in jump tests—higher values mean quicker, stiffer elastic response. It guides plyometric and agility progressions.
Reactive strength index (RSI) measures how quickly you rebound from a jump or hop—contact time divided into jump height in performance testing. Higher RSI reflects stiff, elastic use of tendons and nervous system timing, important for sprinting and change of direction.
Low RSI with long ground contact suggests plyometric progressions and strength work need attention.
Common questions
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How do you improve reactive strength index?
Short ground-contact plyometrics, hops, and jumps paired with strength training typically raise RSI over weeks. Progress volume gradually to protect Achilles and knees.
Related terms
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