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).
«You work
multiple muscle groups when you're using the rowing machine and
so it makes for an effective cardio workout,» says Fitness First personal trainer, Alex Chaple.