The overhead squat is one of the most challenging exercises for the entire shoulder complex. Unfortunately, many people are unable to perform it correctly due to the high mobility demands. Here's one exercise to fix this.
One of the main limitations to performing an overhead squat is end range shoulder flexion. If you can't get your arms fully overhead, you won't be loading it anytime soon! While working on mobility in the standing position can be okay, many lifters compensate by excessively arching their backs. To truly work on shoulder mobility, try the banded-assisted prone PVC liftoff.
This drill is perfect for those who have poor shoulder flexion mobility. The assistance of the band will help pull you into the correct overhead squat position. Do this for 10-15 reps prior to your overhead squat session because it's important to load after your mobility work to groove the new pattern.