1 Rep Max (1RM)
Definition
A 1-rep max is the heaviest load you can lift once for a given movement with technique you would still claim on camera. It is a snapshot of strength, not a personality.
How to estimate without a circus
Do a hard set of 3–5 reps with 1–2 reps left, then use a simple estimate (Epley: weight × (1 + reps/30)). It is close enough to set training loads. A grind-to-death max every month beats you up for little information.
How programs use it
Many templates prescribe “70% of 1RM.” If you have not tested, train by reps in reserve instead — see sets and reps. Percentages are a map. The map is not the terrain if you slept four hours.
Related: muscular strength and overload.
Reviewed September 2026. Not medical advice.
