<p class=p10>1RM is the maximum weight one can lift in a single repetition. You can actually try lifting it, or it can be estimated.</p>
<p class=p10>When you lift your maximum weight in a single repetition, your muscles, tendons and nervous system are stressed differently compared to lifting a much lighter weight many times. Because of this, 1RM calculators have a top limit for reps. Usually it is 10 reps.</p>
