Regular Tai Chi does help with depression but you have to be well enough to get to the class! Lack of motivation is the biggest hindrance to accessing the benefits of Tai Chi. Once you are there, and attending consistently, you have the opportunity for a real transformation.
The Tai Chi Form is a series of postures and we simply move from one to the next. Counting may be used to indicate where each posture occurs.
We can think of normal walking as controlled falling.