You’ve heard that one before, right? It’s the common refrain in every fitness class ever, and in the majority of the bro-centric, muscle-building gyms out there. It’s not bad, either. It’s a refrain ...

Most lifters think of rest as what happens between sets. You knock out your reps, rack the bar, check your phone, and wait a couple of minutes before going again. But what if rest was part of the set ...