Ab workout after tummy tuck?

At 5 months postoperatively,
you should be safe to resume abdominal workouts provided that everything has
healed normally. As your doctor advised, it is important to resume these
exercises gradually and listen to your body. While tummy tucks do help tighten
the muscle, abdominal workout will help improve your strength and further tone
your abdomen. If you have further questions regarding your recovery, I
recommend reaching out to your surgeon. Good luck!

In your case, always checking with your operating surgeon about their specific restrictions is the best answer.  In my practice, I allow core strengthening to start about 2 months after surgery. You may begin with a small fraction of the exercises that you were doing prior. For example, if you are used to doing 50 sit ups you would start with 5-10 and see how you feel before progressing to more over the next week. Your muscles have been pulled together but strengthening them as they are pulled together is still possible.  5 months post op should be fine to start- just double check with your surgeon. It never hurts to be 100% sure.

At 5 months, it is safe to do abdominal workouts but be sure to have a gradually increasing intensity in your workouts to avoid injury. Remember that for the past 5 months you avoided strenuous activities. Consult your surgeon regarding the safe intensity of work and its progression.