I've started doing two weights sessions a week using simple compound movements. Deadlift, Squat and Bench Press. One session is low weights at high reps (usually 20 reps) in an attempt to increase muscle endurance. The other is high weights at very low reps (usually 3 to 5 reps) with a view to increasing strength.
I've lifted weights in the past but not for quite a while. I've missed it and I enjoy it, that's the main reason I've started lifting again. I'd also like to think it will help my grappling in some way.
Do you do any weight training? If so, what do you do?