During the descent of a single-leg squat, a client's knee moves inward. which of the following muscles should the trainer recognize as requiring static stretching?

vastus lateralis

Explanation:

Based on the information provided within the question it can be said that in this scenario the trainer should recognize the vastus lateralis as needing static stretching. This is because this muscle's only task is to extend the lower leg and thus allowing the body to lift itself up from a squatting position. Which is exactly what the client is currently doing in this scenario.

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