The bridge exercise is very good for working pelvic stability. It primarily targets the hamstrings, gluteals and lower back. The idea is to get yourself into a bridge position and then raise one leg without letting the hips on the side with the elevated leg drop down. This works the stability muscles around the pelvis and lower back and is therefore a good exercise for people with lower back pain. Pain can sometimes cause muscles to deactivate slightly and therefore it is helpful to encorporate exercises that begin to fully reactivate those muscles. This video goes through the progressions for the bridge. Remember that form is the most important consideration with these types of exercises. Once you can achieve good form and maintain the position for at least 30 seconds, then you’re ready to add on a progression. Be creative, you can adapt these exercises with your own progressions if you feel comfortable to do so.