Obviously loosing weight is the biggest factor.
Outside of that I would perform the following circuit at least 3x a week
Core circuit x 4 rounds
Plank - work up to 120 seconds
Ab wheel - work up to 30 reps
Hyper back extensions - work up to 60 reps
Roman chair - work up to 30 reps
I'm saying work up to because these are pretty good numbers you might plank for 30 seconds, ab wheel 10 reps, etc. When you start.
