Bodyweight excercises are a key element in any workout, NGR or otherwise.   I have a gym full of high end equipment and I use at least one bodyweight move in almost every workout.  For me the most important thing to remember whether it's a squat, lunge, crunch, pushup or any variation of them - is to FOCUS ON THE MUSCLES YOU ARE USING.

If you are squating think about feeling your glutes (Butt) working, if you're  not and just feel your quads (front of the thigh) you're doing them wrong.   Slow down, keep your weight on your heels throughout the movement, and keep your butt engaged the entire time.  If you do this you'll have a safer and much more effective workout.  If you guys find this helpfull I'll go through each of the basic moves and Jen and I will even post some video.