Yep. Best thing is to do cardio work. Run, bike, blade...anything that gets a sustained 60-80% max heartrate going. (max HR is 220 minus his age).
One trick bodybuilders use is to drink vinegar right before competitions. It helps in definition of muscles. Not sure how it works or if it works at all. A bodybuilder frined of mine used to do it. Your results may vary.
For me, I'/d rather be a little fatter than drink that.
Dave