The chart library
Every chart we use across blogs, calculators, and the book — authored once as code, theme-aware, free to download. Each entry has a permalink, a high-resolution PNG, and a list of where it appears.
Load–velocity profile
The load-vs-speed function for a given lift and athlete. Plot a few sub-maximal sets and you can read 1RM from the line, compare lifts side-by-side, and see why a single percentage of 1RM lands different athletes in different velocity zones.
Bar-speed feedback boosts performance
Randell 2011 — pro rugby players who saw real-time velocity feedback during jump-squat training out-gained the no-feedback group on every transfer test.
Feedback beats internal & external cues
Keller 2014 measured two outcomes from the same three-condition study — acute jump output and within-set fatigue. Augmented feedback won both — ~4× more acute improvement than the best verbal cue, plus an inverted within-set fatigue curve.
Velocity feedback boosts transfer
Weakley 2019 — 4 weeks of augmented velocity feedback in rugby union players. Feedback group beat the no-feedback group on every test, including a peak-power loss the no-feedback group couldn't avoid.