You can get to negative body fat percentages! Fun thing to do is get the ball rolling by playing like normal, then start eating salads every day until you get about -1 lb of fat a day, then binge on burgers and milkshakes three times a day. You lose a ton of fat and gain like 7 lbs of muscle and can do it a few days in a roll until your net fat gain/loss is 0, then you repeat the process. Cutting and Bulking at it's finest? Even with below 10% fat, your teammates will comment on your belly jiggling once you reach certain weight thresholds, though.