Common Mistake
The knees caving in is a common mistake that can happen both during the eccentric and concentric phases of the exercise. The muscles responsible for hip abduction and external hip rotation are either weak or simply not engaged by the athlete. The issue can also lie in the ankles and feet or be part of the issue.
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Solution
Perform the exercise at a slower pace with more effort to keep the joints in line and prevent the knees from caving in. Work on strengthening the hip abduction and rotator muscles. Only go as deep as good alignment allows.
Description
Related Exercises
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