Tai Chi is amazing. Prior to a trip to India I found out about a teacher there who claimed that Tai Chi healed a chronic back injury he had. I had a knee injury at the time that was getting worse the more (bikram) Yoga I did, so I figured it'd be interesting to try. Literally after three classes, I realised my knee didn't hurt anymore. And it never came back. THat was three years ago.
I think it has such good medicinal benefits cos it helps you realign your body, though possibly any martial art would do that. Tai Chi is just a slowed down version so maybe easier to start with. A friend of mine who's a camera man does Tai Chi cos' it helps him stand for hours on end without getting tired or unstable.
You can learn from DVDs and books sure, but keep your eye out for a visiting Tai Chi teacher who does a weekend workshop or some sorts. There's nothing like a few classes with a good teacher to get you in the zone.
"I think the basic anti-aging diet is also the best diet for prevention and treatment of diabetes, scleroderma, and the various "connective tissue diseases." This would emphasize high protein, low unsaturated fats, low iron, and high antioxidant consumption, with a moderate or low starch consumption.
In practice, this means that a major part of the diet should be milk, cheese, eggs, shellfish, fruits and coconut oil, with vitamin E and salt as the safest supplements."
- Ray Peat