reactive strength
Change of Direction Deficit Explained: Calculate Interpret
Calculate change of direction deficit, interpret it against sprint speed, and use it to design targeted COD training programs.
Reactive Strength vs Elastic Strength: Key Differences and How to Train Each
Reactive and elastic strength share the stretch-shortening cycle but train differently. Here is how each is measured and trained without stalling it.
How to Test Reactive Strength Index (RSI): A Precision IMU Protocol
Measure reactive strength index (RSI) with an 800Hz IMU. Includes drop jump vs RSImod comparison and interpretation thresholds.
Beach Volleyball Sand Jump Training: Unstable Surface Power
Build jump height and power on sand. Research-backed training program addressing sand surface energy loss, calf loading, and reactive strength for beach.
Stretch-Shortening Cycle: The Plyometric Foundation
A countermovement jump beats a static jump due to the SSC, but fast and slow SSC need different training. Here's the mechanism and RSI benchmarks.
How to Design a Plyometric Program: Science-Based Blueprint
Too many foot contacts too soon causes tendon pain, not power. Get the volume tables, exercise order by phase, and the RSI tracking that keeps it safe.
How to Test Reactive Strength Index: Complete Protocol Guide
Three ways to test reactive strength index: a contact mat, an IMU sensor, or a force plate, plus norms, thresholds, and coaching cues to use the number.
Taekwondo Kick Speed and Power: Science-Based Training Guide
Biomechanics of elite taekwondo kicks, speed norms, plyometric protocols, and how to measure kick velocity and reactive strength with IMU sensors.