Exercise unit is a term used to describe a set of exercises that are designed to improve physical fitness. The exercise unit includes situp (5 letters), REP (3 letters), CRUNCH (6 letters), pullup (6 letters) and pushup (6 letters). Situp is an exercise where one lies on their back and lifts their upper body off the ground. REP stands for repetition, which is the number of times an exercise is repeated. CRUNCH is an abdominal exercise where one lies on their back and lifts their legs and torso off the ground. Pullup is an exercise where one hangs from a bar and pulls themselves up. Pushup is an exercise where one lies on their stomach and pushes themselves up with their arms.