The 10/5 RSI jump Test is a plyometric assessment used to evaluate an athlete's ability to generate explosive power and elastic strength through repeated vertical jumps. The test begins with a counter-movement jump (CMJ), which is not included in the test results, followed by 10 consecutive vertical jumps with minimal knee flexion. During these jumps, the athlete must minimize ground contact time between each effort. The primary metric, the Reactive Strength Index (RSI), is calculated by dividing jump height by ground contact time. After determining the RSI for each jump, the top five values are averaged to produce the final RSI score for the test.