Benefits of tai chi

I have recently started to go to tai chi classes and I have to say that I really enjoy it and and I feel that it has great benefits.
My class is made up of a small mixed bunch of people of all different ages and backgrounds and it has a very amicable, relaxed atmosphere.
Tai Chi is a very gentle form of exercise which is beneficial even for people suffering from chronic conditions such as heart disease and arthritis, however you do feel after a class that you have strengthened and stretched the old muscles and the breathing technique is great not only for relaxing, but I have found it useful for other sports too such as swimming.
Aside from the physical benefits, I find the Qi Gong very relaxing indeed and I always come out of a class feeling both very relaxed and like I have really toned up!