A back squat is the traditional powerlifting method (bar across your traps behind the neck.) It makes you balance the weight with different muscles (for front squad you need to engage your glutes/erector spinae and for back squats it is more of a general core.)

I'm into olympic lifts so I like this:
Hang Snatch
Behind the neck press
Over head squat
Good morning
Back Squat

5 reps for five exercises. I use 65 lbs of weight and weigh 150 lbs.