Ask ten people how hard a set was and you’ll get a small theater festival. Someone grades it like wine. Someone says “pretty hard” and shrugs. Someone has been a perpetual 7.5/10 for three years.
Reps in reserve is supposed to cut that down to one question: how many clean reps did you leave in the tank?
Zero means you couldn’t have done another honest one. Two means about two were left. That’s the whole gadget.
Why bother writing it down
185 x 8 after a good night and 185 x 8 after a red-eye are not the same set. Load and reps alone won’t admit that. A rough RIR note keeps hard sets comparable across messy weeks, which is where most training lives.
It’s also a useful anti-heroism device. A lot of productive work sits a couple reps shy of failure. Writing that down stops the log from pretending every top set was a death march.
Keep the scale blunt
If you need half-reps to feel precise, you’re probably performing.
| RIR | In normal words |
|---|---|
| 4+ | Easy. Warm-up weight, or the working set was too light. |
| 3 | Worky but roomy. You could still talk between breaths. |
| 2 | Proper hard set. Form still clean. About two left. |
| 1 | Ugly hard. Maybe one clean rep left. |
| 0 | Nothing clean left. Call it failure if that’s what it was. |
A blunt 2 you mean beats a stylish 1.7 you don’t.
Where people fake it
The common mess is rewriting history after the set. Bar speed died, spotter leaned in, and somehow it was “probably a 2.” Grade the set that happened.
The other mess is using RIR as a hall pass to never progress. If the plan wants the top of a rep range near 1–2 RIR, living at a comfy 4 forever isn’t autoregulation. It’s avoidance with better vocabulary. Double progression still needs an earned gate.
And don’t confuse pain with effort. Stopping because your shoulder complained is not automatically a 0 RIR strength set. Write the pain note separately. Those are different sentences.
How it looks in a real notebook
You don’t need a special column on every line. Put RIR where it changes a decision:
Squat 225 5,5,5 @ ~2 RIR. Last set slower but clean.
RDL 185 8,8 @ 3 RIR. Leave here unless sleep improves.That’s enough for a coach. It’s enough for software that isn’t pretending your phone has force plates.
In Flexbound, plans often carry an RIR target next to sets and reps. You still write the session however you write. The win is that the plan and the log speak the same effort language, instead of inventing a new rating system every program change.
When you can ignore the whole thing
Newer lifters can get far on “add weight when it feels easy.” Super short sessions might only need hard / not hard. Meet peaking has its own rules.
RIR earns its keep in the broad middle: not beginner magic, not contest peaking, just week-to-week hard sets that get fuzzy in memory. Use it there. Skip the cosplay.