With many of my personal training athletes, I use the overhead deep squat as a movement pattern to assess limits within the body. I have posted the video of this exercise/movement so you can perform a self-assessment.
The ability to perform the Deep Squat requires an optimal body weight squatting pattern and a poor performance of this squat can alert you to some stability, mobility and asymmetries within your body that may lead to run specific problems.
The Deep Squat is used to challenge bilateral, symmetrical, functional mobility and stability of the hips, knees, and ankles....ALL very important for running injury free.
In this video, I use two power balls of four pounds each. Using weight is NOT neccessary and NOT recommmended. Just hold your hands overhead, trying to keep them straight and overhead as much as possible. This is not an exercise, but a movement pattern assessment. Do not use heavy weight.
Try this out and lets us know how well you perform - E.