The reviewers found few studies evaluating the effectiveness in the ACL rehabilitation process of so - called «open chain» exercises (those which tend to isolate a single
muscle group and a single joint, such as leg curls and leg extensions, with or without
added weight) versus «closed chain» exercises (those which work
multiple joints and
multiple muscle groups at once, such as, for example, a squat involves the knee, hip and ankle joints, and
multiple muscles groups, e.g. quads, hamstrings, hip flexors, calves and glutes, with body weight alone or with
added weight).
Perks: This compound movement allows
multiple muscle groups to be worked with one exercise, making it time efficient and
adding to the difficulty of your workout.