OVR Performance on Instagram: "What is a 4 Jump RSI Test? RSI (Reactive Strength Index) measures explosive power by comparing jump height and ground contact time. 🔢 4 Jump Test - Focus on quick power jumps with minimal ground contact time. 📊 What the Data Tells Us - High RSI = Superior explosiveness and elasticity - High Jump Height + Slow GCT = Strong with slow reactivity - Low Jump Height + Fast GCT = Quick reactivity, needs more power How do you use RSI in your training? #GamifyYourTraining