RSI
CMJ Depth Inconsistency Is Quietly Wrecking Your Power and RSI Comparisons
A few centimeters of extra dip changes peak power and RSImod more than fitness does. Here's how to standardize CMJ depth and stop chasing noise.
RSI Inflated by Short Contact Time: How to Find and Fix the Measurement Error
A drop jump reads RSI 3.1 with a 0.09s ground contact time that felt nothing like a stiff bounce. Here's why timing-gate error inflates RSI and how to retest.
Fixing CMJ Eccentric-Concentric Phase Split Errors From Arm Swing and Unweighting Drift
CMJ phase detection error skews RSI and power output when arm swing or fast unweighting move the eccentric-concentric split. Here's how to catch and fix it.
Flight-to-Contact Ratio: Diagnosing Whether a Jump Problem Is Slow Contact or Low Flight
RSI dropped, but why? Split flight time from ground contact time to tell slow contact from low flight before you pick a fix.
Selecting Drop Height with the Reactive Strength Ratio
Most athletes drop jump from a height picked by eyeballing a box. Use the reactive strength ratio and a short testing ladder to find yours instead.
10/5 Repeated Jump Test: How to Calculate RSI (Protocol)
Want a reliable reactive strength number without force plates? Follow this 10/5 jump protocol: setup, RSI calculation, benchmarks, and reliability data.
Sport-Specific Power Testing for Basketball Players: Protocols, Norms, and Programming
One vertical jump number will not tell you if a player is game-ready. Covers jump, sprint, change-of-direction tests, RSI norms, and a testing plan.
How to Improve Vertical Jump Height Fast: A 4-Week IMU-Based Program for +5cm Gains
This 4-week, IMU-measured jump program combines CMJ, drop jumps, and deployment jumps for an average +5cm gain, tracked at 800Hz — no guesswork needed.
How to Improve Vertical Leap for Volleyball: A 12-Week IMU-Driven Training Program
Volleyball players plateau because generic jump programs skip attack-specific power. This 12-week plan uses 800Hz IMU testing to target your weak link.
How to Test Drop Jump RSI with an IMU: A Standardized Protocol and Interpretation Guide
A standardized drop jump RSI testing protocol using an 800Hz IMU. Box height selection, warm-up, execution, and data interpretation explained step.
Force Deck vs IMU: Jump Measurement Accuracy, Metric Agreement, and Field Reality
A lab-grade force plate and an 800Hz IMU can still disagree on jump height. See the ICC, Bland-Altman limits, and which tool is accurate enough.
Plyometric Progression Guide: From Beginner to Elite
Jumping to depth jumps too soon invites injury. This 5-stage progression, built on 800Hz IMU data, sets objective pass criteria before you advance.