Here is an exercise you can do to tighten the tummy. CAUTION: Any back problems, keep the head on the floor!
Bring both legs to your chest; as you raise your legs, breathing out keeping the small of the back pressed against the floor and tighten the tummy. Hold for a count of 3, a slow count, and then; slowly extend the legs out, breathing in and NOT allowing your legs to touch the floor unless your have back problems.
12 repetitions AND don’t cheat!
Do this as often as you like.
NOTE: During the day ALWAYS keep your tummy tucked in to avoid extra pressure on your back. From the Heart, Maggie