You're in your prime and physically fit, but when you tuck your shirt into your pants, you get a midsection bulge - - why? Two options to resolve this issue: (1) Try a slimmer cut shirt (European shirts vs. American); many makers offer full or tapered. Or (2) have the shirt altered, and many specialty stores can do this for a nominal fee. When it's all said and done -- it simply means the shirt is too big!
