Hi im 17yrs old. I preety much havent done any 'major' physical excerise or dumbell excerise for a while and I dont goto the gym. Im not fat but can see a gut starting.

The strange thing is i still have general muscle around the place. eg. biceps, abs, pecs. Im not overweight and dont see why i should have pec muscles becuase I dont work them. (Right is better than left too).

Any ideas on how to either get rid of them or get the left bigger. (Using simple dumbells at home)