I'm not sure what your goals are, but if you are an athlete I would recommend Yoga or something that will improve your flexibility. You won't burn a ton of calories, it will greatly contribute to your mental health and you will obviously gain a ton of flexibility which is why most athletic injuries (the ones on the field) usually happen.

Like I said, some people think "Yoga" is gay, so if you have misgivings about doing it just find something that will make you more flexible.