The term refers to a weight training schedule where each muscle group is typically isolated and trained on a separate day. For instance, one day may be dedicated to chest exercises, another to back, a third to legs, and so on. This method allows for focused attention on individual muscle development and generally involves high volume training for the targeted muscle group during its designated session.
Its historical popularity stems from its prevalence within bodybuilding culture and its perceived effectiveness in promoting hypertrophy. The approach offers ample recovery time for each muscle group before it is trained again, potentially maximizing muscle growth. Proponents also value the concentration it allows on specific muscle areas, facilitating a mind-muscle connection.