reactive strength
Countermovement Rebound Jump Test: Full CMRJ Testing Protocol
A CMJ that lands and rebounds into a second jump. Get the CMRJ protocol, contact-time benchmarks, and why it catches fatigue a jump-height test misses.
Sprint Velocity Plateau: How to Diagnose and Fix Stalled Speed
Stuck sprint times rarely mean the athlete needs more sprints. A field protocol to find whether force, technique, or stiffness is the actual limiter.
Optimal Drop Jump Box Height: Find Your h-opt in 5 Tests
RSI drops once you pass your true peak height. Test 5 box heights 10 cm apart, plot the curve, and pinpoint your h-opt with this step-by-step protocol.
RSI-Modified Explained: The Countermovement Jump Reactive Metric
Your CMJ height looks fine, but something's off in the timing. RSImod explains why — the formula, protocol, real research findings, and common testing errors.
How to Test Lower Body Stiffness with an IMU Sensor
Lower body stiffness predicts sprint speed and injury risk. An IMU sensor scores it from a hop test in minutes, with validated protocols and clear targets.
Ground Contact Time in Plyometric Training: How to Measure and Minimize It
How to measure and reduce ground contact time in plyometric drills to maximize reactive strength, speed, and sport performance with IMU-based testing.
Depth Drop Reactive Strength Progression: 8-Week RSI Development
8-week depth drop progression for RSI development. Drop heights, contact time targets, landing mechanics, and PoinT GO IMU tracking.
How to Perform Drop Jump RSI Test: Finding Optimal Height
Using the same drop height for every athlete skews RSI. This protocol covers box height selection, cues, and benchmarks for each athlete's optimal drop.
How to Accurately Measure RSI with Drop Jumps
The wrong drop height skews your RSI numbers before the test starts. This guide covers optimal box heights, flight-time calculation, and norms by sport.
Basketball First Step Quickness: Neuromechanics, Training Methods, and Measurement
How to develop explosive first-step quickness for basketball — ground contact time, hip extension velocity, reactive strength, 5-10-5 norms.
How to Train Reactive Strength for Athletes
Reactive strength runs on drop jumps and ankle stiffness drills, not box jumps alone. Get RSI targets, an 8-week plan, and how to measure each session.
Reactive Strength Index (RSI) Explained: What It Is and Why It Matters
RSI is jump height divided by ground contact time, but a good score varies by sport and level. Here is how to test it correctly and pick drills that help.