My gym uses the Cybex Squat press that is so famous in many of the 1/2 and 1/4 rep videos that get posted here.
I've always positioned my feet about midway up and lowered the weight until my thighs hit my chest, which I estimated to be about just below parallel if I compared it to a regular squat.
Not wanting to be a half repper, I experimented with the calves to the hamstring method I've seen mentioned here. My knees are killing me, and now there's pain on the back of left knee as well. This has happened both times I've tried it.
Does anyone have advice on the correct method?