Glossary/Training

Reps in reserve (RIR)

Definition

Reps in reserve is how many more reps you could have done when you stopped a set. RIR 2 means you had two reps left.

In more detail

It is a simple way to say how hard a set was. Most sets for muscle and strength end at 0 to 3 RIR.

People tend to underestimate how many reps they have left, especially on lighter sets, so it takes some practice.

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