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ground contact time

The Cadence Threshold Where Race Walking Economy Starts to Break Down
guides·9 min read

The Cadence Threshold Where Race Walking Economy Starts to Break Down

Push cadence too far in race walking and economy costs rise before the legality benefit does. See the research and a protocol for finding your own threshold.

race-walking·cadence·running-economy
How to Measure Ground Contact Time with an IMU Sensor
how to·9 min read

How to Measure Ground Contact Time with an IMU Sensor

Ground contact time separates elite sprinters from the rest by milliseconds. See the foot-sensor thresholds, sprint norms, and force-plate accuracy data.

ground-contact-time·imu·sprint-mechanics
Ground Contact Time in Plyometric Training: How to Measure and Minimize It
exercises·8 min read

Ground Contact Time in Plyometric Training: How to Measure and Minimize It

Ground contact time benchmarks for 5 athlete levels (100-280ms) with matching RSI scores, plus 5 coaching cues that shorten contact time.

ground-contact-time·plyometrics·reactive-strength
Reactive Strength Index (RSI): Complete Training Guide
guides·10 min read

Reactive Strength Index (RSI): Complete Training Guide

There is no single good RSI score; the benchmark shifts by position. Covers measurement, position norms, ground-contact protocols, and progress tracking.

RSI·reactive-strength·plyometrics