Why do some workouts (like abs) cut down size while some (like biceps) build size?

Question

Why do some workouts (like abs) cut down size while some (like biceps) build size?

In: Biology

Answer 1

Well…they don’t.

Exercising muscle builds muscle fibers.

To reduce the size of one’s belly, you need to reduce your body fat percentage. Less overall body fat means more visible muscle tone, like having defined abs.

Doing ab exercise burns some calories, but doesn’t really contribute an awful lot to reducing body fat. The main thing to do is cut down on calories going in to the body, and cardio type exercise to burn calories.