Physical exercise, martial arts, and meditation are often mentioned on this site. You must seek the advice of your doctor or physician before engaging in any course of physical activity, changing your fitness regime or beginning a new one, or changing your diet, etc.
You should also seek a professional physical fitness coach, martial arts instructor, as appropriate for your physical regime.
Likewise with meditation. Meditation and related practices, such as Chi Gong, can have a powerful effect on the mind and body, and, as such, should always be learned under the direction of a qualified teacher or instructor.