Gym iteration is a term used to describe a set of exercises that are repeated multiple times. The two crossword solutions for this term are situp (5 letters) and REP (3 letters). A situp is an exercise where one lies on their back with their knees bent and feet flat on the floor, then lifts their upper body off the ground while keeping their lower body in place. A REP is a repetition of an exercise, meaning it is done multiple times in a row.