Training Science / / 2 min read
Your 1RM is more than a bragging right
Your estimated one-rep max drives your training percentages, detects fatigue, and powers how Stay Ready builds every workout. Here's why it matters.
Nobody should actually test their one-rep max regularly. It's risky, it's draining, and it tells you what you can do on your best day, which isn't useful for programming your average day.
But knowing your estimated 1RM? That changes everything about how you train.
The quick math
Stay Ready uses the Epley formula, one of the most validated e1RM equations in sports science:
e1RM = weight × (1 + reps / 30)
Bench 225 for 6 reps? Your estimated 1RM is 270. The formula is most accurate in the 2-10 rep range, which is why Stay Ready stops counting reps past 12 on free-weight lifts, and gives machines and bodyweight work their own, gentler divisors.
You never need to do this math yourself. Log your sets honestly and the app handles it. Or try it now: the lift calculator takes one set you really did and shows the working sets it leads to.
Why it actually matters
Your e1RM isn't a vanity number. It's the foundation for three things that drive your progress:
Training percentages. "Work up to 80% for 5x5" only means something if you know what 80% is. Your e1RM makes percentage-based programming actually work.
Real progress tracking. If your e1RM goes up over time, you're getting stronger, even if your working weights and reps look identical session to session. This is the difference between thinking you're progressing and knowing it.
Fatigue detection. If your e1RM drops while your training volume stays the same, something is off. Under-recovering, under-eating, or too much accumulated fatigue. The number catches it before you feel it.
What Stay Ready does with it
Every set you log triggers an e1RM recalculation. That feeds into:
- Horsepower scoring: your strength relative to your bodyweight across all lifts
- Load suggestions: the app knows when to push weight up and when to hold
- Warm-up ramps: your working sets determine the progression
- Stall alerts: if your e1RM flatlines for 2+ weeks, you'll know about it, with suggestions for what to change
The point isn't to obsess over the number. The point is that the number does the thinking for you, turning every routine set into data that makes your next session smarter.
Related
Coming back after five weeks off
Five weeks away does less to your strength than it feels like, and the first session back is where people get hurt. What the research says, what a good trainer does, and what Stay Ready prescribes on day one.
You went to failure last set. What happens next
A true RPE 10 is information and a bill. What the research says failure buys you, what it costs tomorrow, and how Stay Ready re-plans the rest of the session and the next one.
Last thing
The app runs on the same principles.
Every workout it builds, every rep it tracks and every recovery call it makes comes from this reasoning.
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