Change Jack's abilities

"I wish Jack didn't get laid so often," you say and your vision swims. The beautiful blonde is no longer present, though Jack is still around. He's laying on his bed, his PC out, and he looks different. Gone is the washboard abs and party clothes. Instead, he's looking far more casual, as if he were staying in for the night.

"Why, um, why aren't you at the Sigma Omega Alpha party tonight?" The words escape your lips before you can stop.

"Dude, you know I don't party that often. Gotta keep my body ready for the game!" He flexes one arm and it does look much thicker of muscle.

Wait, does the new Jack work out more and focus more without the constant sleeping around? Or was it that he is doing better as a time replacement? How did this wish power work?!

"Alright, uh. Good luck, then." You turn over in your bed. You need to test it... if you are able to do just that, should you even change things more? Jack is the perfect guinea pig... there are options, of course. The dude has been a total douche to you, and maybe still is? What can you do that won't rock the boat too much...?