Where part of the problem lies is in the assumption that a single should always or usually be heavy or maxed. The single, the heavy single, and the 1RM should really be seen as three different terms entirely.

Intensity is much talked about in bodybuilding, but what is it? Is it taking sets to failure? Lots of volume? Dropsets? Supersetting?

Muscle fatigue and muscular endurance—each is different for every athlete.