When to rack the bar: autoregulation without a sensor

Velocity-based training is one of the most useful ideas in modern strength work: bar speed is a real-time window into fatigue. When the bar slows dramatically, you are no longer training strength — you are accumulating fatigue and inviting form breakdown. The problem is that the sensors that measure this are expensive and fiddly.

Inferring speed from effort and reps

Misi estimates bar velocity from the data you already log — your reps and rated effort (RPE) — and maps each set into a velocity zone, from explosive speed-strength through hypertrophy to grinding absolute-strength territory. No hardware required.

The 20% rule

When estimated velocity drops more than roughly 20% within a session, Misi raises the "rack the bar" cue. That threshold is the practical line between productive work and junk volume that only deepens fatigue. Stopping there protects the next session as much as the current one.

Why this beats ego lifting

Autoregulation means letting today's readiness set today's workload, rather than forcing a number on the page. Over a training block, knowing when to stop a set is as valuable as knowing when to push — it is the difference between consistent progress and a cycle of overreaching and recovery.

The last grinding rep rarely makes you stronger. More often it just makes tomorrow worse.