I've been trying these out so I could get multiple benefits at the same time:
1. Improved shoulder mobility
2. Stronger shoulder girdle
3. greater hip mobility
4. better hip activation and make myself push the knees out hard
5. Work my core out a little more than with a back squat
6. As a mobility/activation general warmup
I'm keeping sets between 3-5 and sets 6-12 as the work right after my speed squats.
For the warmup overhead squats, I do this before any workout day, I grab an empty bb, snatch it into position, start overhead squatting 'bouncing' in the hole for 5 controlled times, then go back up and repeat 4 more times.
How come not many PLers do overhead squats? Are there better ways of achieving the above goals in one fell swoop?