It is a workout regimen where different muscle groups are targeted on separate days, rather than exercising the entire body in a single session.
[1] This type of training is mostly used by bodybuilders and fitness trainers, while professional lifters typically avoid this approach.
Then, the exercises for pull muscles (latissimus, trapezius, rhomboids, biceps, and rear deltoids) are worked on the second day.
[citation needed] Workout sessions are usually divided between the upper- and lower body, which often includes the abdominal muscles.
It is named after Arnold Schwarzenegger, who popularized the routine during his preparations for the second Mr Olympia.