Step-by-step, no fluff.
Practical guides for improving athletic performance and training smarter with measurable data.
How to Find Critical Velocity From Two Time Trials: A Field Protocol Without Lactate Testing
Set a real threshold pace from two time trials and a calculator, no lactate strips or lab visit required. Full critical velocity test protocol, math, and norms.
Curling Delivery Slide Stability Test: Measuring Lunge-Hold Sway
A stone drifting wide despite consistent weight often traces to slide-hold sway. An IMU protocol for measuring mediolateral wobble in the curling delivery.
Fixing a Suspicious Left/Right Balance on Your Cycling Power Meter
A sudden L/R swing on your power meter is often crank drift or bad calibration, not new muscle imbalance. Here's how to tell the two apart.
The Discus Rotational Release Velocity Test: Acceleration Phase vs Release Instant
Trunk angular velocity climbs but release velocity stalls. The two-sensor protocol, transfer-ratio bands, and cited biomechanics behind where power leaks.
Measuring Discus Rotational Velocity: Where Release Speed Actually Leaks
Turn two clocks faster than turn one on your wrist IMU, but release velocity hasn't budged in weeks. Here's the turn-by-turn breakdown that finds why.
Dual Force Plates: When Crosstalk Fakes an Asymmetry
A 'weak' side on a dual force-plate CMJ can be crosstalk between plates, not real asymmetry. Here's the swap-side test that tells them apart.
Fencing Lunge Explosiveness Test Protocol: Measuring Reach Distance and Push-Off Time
Two fencers post nearly the same lunge reach on tape, but one rear foot fires far faster. A fencing lunge power test that scores distance and speed together.
How Filter Cutoff Frequency Choice Alters Jump Height
A low-pass filter's cutoff Hz decides how much of the takeoff spike survives before double integration builds jump height, and the wrong value biases every rep.
When Wearables Misread Your Foot-Strike Pattern: Why Pod and Insole Labels Flip
Your shoe pod and insole disagree on rearfoot vs midfoot vs forefoot for the same run. Here's why the labels flip, and how to verify them against video.
Force-Plate CMJ Phase Identification Errors: How Unweighting, Braking and Propulsion Get Mislabeled
Braking RFD jumped 50% overnight? Your force plate likely mislabeled the braking-propulsion boundary. Fix CMJ phase identification errors before they skew data.
Fixing Force Plate Peak Force Clipping With Heavy Athletes
A 148kg prop's landing or pull can hit the plate's rated ceiling before it hits true peak force. Here's how to spot clipping and size capacity correctly.
Why a Low GPS Sample Rate Underestimates Acceleration: 10Hz vs 18Hz Explained and Fixed
Short cuts and stops finish in under a second - a 10Hz GPS unit can miss the actual peak. See why sample rate skews acceleration data, and how to fix it.