Any ideas on how to tighten my lower abs? I've lost a lot of body fat around my stomach under the skin and my upper abs are getting tight. But just under my navel it sticks out a lot like i'm bloated or something. Is this caused by fat under the muscle or just weak muscle not holding it back? If it's caused by having weak muscle is there any exercises to really work it? I've tried all sorts of lower abs workouts and nothing seems to really target that spot.