If you're training regularly, then the next best thing IMO would be to do basic stuff when you wake up in the morning and before you go to bed. Right when you get up, do some shadow boxing & footwork drills, static stretches, calisthenics, plyometrics. At your age, you should be trying to build up your body, maybe take up a S&P program like 5x5 Stronglifts. Maybe think about yoga to get more limber and learn a good stretching routine. If you have it in you, go for a morning run to work up your cardio.
There are any variety of things you can do, but more important than anything is to train.