Im doing a system where in a week I have to complete 200-250 body weight squats - 200 pushups and 30-50 pull-ups. I have a piece of paper and throughout the day ill just drop down and do pushups or squats etc then mark it off on a piece of paper.

Anyways, with the squats I have a couple of questions. First, how do you get it so squatting targets the hamstrings? everyimte I do it I feel mostly quad work, some glute work barley any hamstring work and as far as I can tell zero calf work.

2nd, ive done about 90 squats today and my knees feel kind of weak/fatigued but I dont have any pain, its as if the muscle or tendons have been worked out but not in a bad way - is this possible?

Im almost 17 if that helps.