i am 6"3 and 13st7lbs (approx 190lbs) i'm quite leanly built but have a little fat on my stomach that i want to get rid of to get my six pack back, i'm 19 and have only put on this fat in the last year or two.

however i don't want to do too much running and dieting because i don't want to lose muscle mass.

any training tips to shift the fat and keep the muscle