I'd say that the whole training aspect helps guard the body from injuries and imbalances the streching, caleshtic, aerobic and kata. Regular kata done at a slower Tai chi like flow and speed can help strecht joints, tendons and muscles, it can also be a stress reliever. Then you have the Iron shrit katas that once the rountine is recorded you start learning to channel energy as in Qi Gong exercises. So healing and preventive injury can be acomplished, and as any Doctor will tell you relieving stress in paramount bc Stress Kills.