Jiu jitsu: Whenever my are injured I usually encourage them to come in periodically and watch from the sideline. Why? When you can't your body – train your MIND. Remember always that the mind governs our actions. You want a faster game in JiuJitsu? That will require a mind that can process options faster just as much as a faster body. The problem is that when most watch Jiu jitsu they FOLLOW the action rather than try to JUDGE and ANTICIPATE the action. They look only at the RESULT rather than the PROCESSES that brought about the results. When you watch, picture yourself out there and ask yourself second by second what you would be doing in their stead. How you would respond to other fellows attacks and defenses. Get engaged when you watch. The mental workout is every bit as useful and productive as the physical the athletes on the mat are having.