This is Nicole from CrossFit HQ in CA. doing a perfect overhead squat with 95 lbs during a contest. She won the contest with 25 reps straight at a body weight of 110 lbs. Check out crossfit .com for the video
In as few sets as possible and for time
75 reps of OHS w/ PVC, 45lbs or 95lbs
This will be extremely challenging if you really push yourself.