Walk into any hardcore gym in the seventies and you’d see it everywhere. Lifters crowded around a barbell, sleeves rolled tight, fighting through a set of curls that burned so intensely it became a ...

Walk into a serious gym in the 1970s, and you’d often see lifters cranking out 21s — partial and full reps combined for a brutal, muscle-frying pump. These sets weren’t a gimmick; they created tension ...