Estimating 1RM without maxing out.

A real 1RM attempt costs you a nervous-system withdrawal, three to seven days of recovery, injury risk, and a number that is already out of date next week. It is also emotionally expensive: most athletes underperform when a single rep decides whether the session was a success.

The point of a 1RM is not the number. It is the anchor for the rest of your programming. If you can get that anchor without the attempt, you should.

For any given compound lift, the relationship between load and mean concentric velocity is close to linear across the useful range. Plot four points - say 40, 60, 75 and 85 percent of your last known 1RM - and you get a straight line with a very small residual error.

Extend that line to a specific velocity value, and the load at that velocity is your true 1RM.

Every exercise has a characteristic velocity at which its true 1RM occurs - the minimum velocity threshold (MVT). It is highly stable within an individual across time.

• Back squat - approximately 0.30 m/s MCV
• Bench press - approximately 0.17 m/s MPV
• Deadlift (conventional) - approximately 0.15 m/s MCV
• Overhead press - approximately 0.20 m/s MCV

Your ORCA app refines these to your personal MVT once you have logged at least one true 1RM per lift. Until then it uses the published population values.

Warm up thoroughly. Then perform one set of two to three reps at each of the following loads, resting at least three minutes between sets:

1. ~40 percent - expect > 1.00 m/s
2. ~60 percent - expect ~0.75 m/s
3. ~75 percent - expect ~0.55 m/s
4. ~85 percent - expect ~0.40 m/s

Every rep must be executed with maximum concentric intent. If intent varies, the line will bend and the estimate will be wrong. Take the fastest rep of each set.

Peer-reviewed comparisons put the load-velocity estimate within roughly two to five percent of a true 1RM on the squat and bench press, with a standard error smaller than the day-to-day variation of the true max itself. In practice, this means the estimate is at least as informative as the number you would have grinded out - and it did not cost you a week of recovery.

Treat the estimated 1RM the same way you would treat a fresh, tested max. Use it to derive percentages for the coming block, to inform load selection when velocity zones are not available, and as a longitudinal marker of progress.

Re-test every two to four weeks. It takes five minutes.