I am 64. I believe I have a weakening of the stomach wall just above my navel, about an inch to an inch and a half wide and about 4-5 inches in length, which protrudes when I, say, do sit ups or sit up in bed. There is no pain. What exactly is goin on here, and should it, can it, be fixed. I do lift light weights, multiple reputations, 2-3 times a week.