Step-by-step, no fluff.
Practical guides for improving athletic performance and training smarter with measurable data.
Horizontal Force-Velocity Sprint Testing With Motorized Resistance
Two sprinters can post the same 10m time for opposite reasons. Resisted sprints split F0, V0, and power to find which one is holding yours back.
Erratic Morning HRV Readings: A Troubleshooting Guide to Separate Signal from Noise
HRV bouncing 20+ ms between days with no training change? Before you distrust the metric, check posture, breathing, and measurement timing - here's how.
IMU Sampling Rate Too Low for Plyometrics: How to Diagnose and Fix It
Ground contact under 200ms needs real timing resolution. See how low IMU sampling rate creates quantization errors that skew RSI, and the minimum Hz to use.
Fixing IMU Step Count Errors on Turf Sprints: Retuning Thresholds for Short Contact and Slip
IMU step counts drop on turf sprints when short ground contact and foot slip weaken the impact signal below your detection threshold. Here's the fix.
Troubleshooting Inconsistent Sprint Trial Times: A Standardization Protocol
Sprint trial inconsistency usually is not the athlete. It is the start method, lead-in distance, or rest interval shifting between reps. Here is the fix.
Fixing Flywheel Power Readout Errors from Encoder Slip
Eccentric ratio over 180%? It's usually strap slip or cone winding, not the encoder. Here is the inspection and spin-test protocol to fix it.
Isometric Belt Squat Test: Measure Leg Strength Safely at Home
No spotter, no bar overhead, still a real number. Set up an isometric belt squat test at home with a pin, a belt, and a scale you already own.
Troubleshooting Jump Sensor Overreads on Soft Surfaces: Mats, Turf, and the Contact-Delay Fix
Jump sensor overread on mats and turf comes from delayed ground contact detection. See the mechanism, real research, surface risk table, and a calibration fix.
How Arm Swing Inflates Your Jump Test Height (And How to Fix It)
Loose arm-swing rules can shift CMJ and squat jump height by several centimeters between sessions. Fix hand position so numbers reflect leg power, not arms.
Landing Error Scoring System (LESS): The Full Assessment Guide
A stiff, knee-caving landing on a jump task predicts more than a vertical jump number ever will. Here is the 17-item LESS protocol, scoring, and fixes.
Methods for Testing Maximal Sprint Speed Compared: Radar, Gates, GPS, and IMU
Radar, timing gates, GPS, and IMU rarely agree on the same sprint's top speed. Here's where each method's error comes from and which to trust for what.
The Motocross Arm-Pump Grip Test: Measuring How Fast Grip Force Decays Under Repeated Squeezes
Grip doesn't fail all at once on a moto, it decays rep by rep. This 15-squeeze protocol clocks exactly how fast, before arm pump costs a lap.