The Ass is Willing but the Knees are Weak

Short Message today:

Let's talk about squats:

1.)They WORK - My butt is already changing.
2.)I'm afraid they are going to mess up my knees...
3.) I want to find an alternate exercise to boost my buttocks.

So I want to know.... how do you all work out your asses?

Food today - Kashi milk banana turkey burger, fresh fruit, coke, 2 pieces of pizza, caramel apple pie, amp energy drink,  almond wheat thin, a whole packet of twizzlers (it is more difficult to eat a lot on show days)

exercise - none