If you lay on your back and pull your knees to your chest you can stretch the lower back a little. Feels pretty good. Another one I like to do are scorpions and I can't remember what it's called but it's the same as scorpions only you do it laying face-up instead of face down. I found both these two latter ones pop a spot in my back that is the same spot the chiropracter pops so I figure it's like getting free DIY chiropractic.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Current squat: 160 x 2