Step-by-step, no fluff.
Practical guides for improving athletic performance and training smarter with measurable data.
In-Season Groin Squeeze Force Monitoring: Catching Adductor Injury Risk Before It Becomes a Strain
A squeeze score can slide 15% for three straight weeks before anyone notices. Here's the weekly protocol and drop thresholds that catch it early.
Gymnastics Landing Force Asymmetry: A Stuck-Landing Test for Quantifying Left-Right Impact Imbalance
A clean stuck landing can still split force unevenly left to right. Get the dual-plate protocol, asymmetry index formula, and interpretation bands here.
Hammer Throw Turn Tempo: An IMU Protocol for Rhythm, Not Just Peak Speed
Turn tempo, not peak turn speed, separates clean hammer throws from stalled ones. The IMU protocol for measuring turn timing and rhythm consistency.
Measuring Handball Jump Shot Release Velocity With an IMU: Separating Arm Whip From Body Momentum
Jump shots leave the ground before release, so arm whip has to cover what body momentum can't. Dual-IMU protocol, benchmarks, and 2 cited handball studies.
Hip Labrum and FAI Return-to-Sport Benchmarks: Hip Flexion and Rotation Strength
Cleared on paper, unstable on a cut. Hip flexion and internal rotation strength plus a 45-degree pivot test are what standard charts miss. Full protocol inside.
Hurdle Clearance Rhythm Test: Measuring Lead Leg Timing and Step Consistency Between Hurdles
Splits look clean but hurdle six tells another story. A CV protocol for inter-hurdle rhythm and lead leg timing that catches breakdown before it shows up.
Fixing IMU Temperature Drift That Corrupts Cold-Weather Sports Sensor Data
A locker room to sub-zero snow swing throws MEMS sensor bias off before the compensation curve catches up. Here is the soak-and-re-zero fix for cold IMU drift.
Isometric Bench Press Test: Measuring Upper-Body Force and RFD
No bar path, no technique, just output: the isometric bench press test isolates pressing force and RFD the same way the IMTP does for the lower body.
Javelin Approach Run and Block Step Velocity Testing: How Speed Survives the Plant
A blazing run-up means nothing if the plant leaks it. Get the block deceleration-ratio test, plant mechanics, and 2 cited studies on javelin energy transfer.
Javelin Release Velocity Measurement Guide: Combining Radar and Video Frames
A radar gun locks onto the sprinting body, not the thin javelin shaft. Here's the frame-count video check that catches the error before it costs a session.
The Judo Kumikata Grip Fatigue Protocol: Measuring Decline Across Repeated Gripping Cycles
Judo grip fatigue test that scores repeated kumikata grip-hold cycles, not one max squeeze. Setup, decline scoring, benchmarks, and the research behind it.
Jump Mat Contact Time Error From Floor Flex: Why Sprung Floors Inflate Your Numbers
A sprung or suspended floor under your jump mat can stretch measured contact time and quietly deflate RSI. Here's how to spot it and fix the setup.