Squat exercise : classic multiple-jt exercise become an integral part of most lower-extremity strengthening & postoperative ACL rehabilitation programs.
Squatting activities : extensor moments produce at ankle, knee, and hip jts must be coordinated to control the descent & ascent of the body’s center of mass.
The multiple-jt characteristics of these movements use intralimb substitution patterns
-shift effort from a targeted muscle group (eg, knee extensors) to another (eg, hip extensors).
Bilaterally exercises may shift effort from targeted limb (involved limb) to contralateral limb.