Here's a great personal story about Tai Chi and Kung Fu. The author is a fellow student at the Capital District Tai Chi & Kung Fu Association.
I was a student there years ago, but stopped around the time our first daughter was born. I'm back now, and my daughter is also doing Tae Kwon Do at the same place in the Pil-Sung Martial Arts program.
For anyone interested in martial arts, all of these programs are an excellent introduction. For many students, it becomes a way of life. I'm not there yet, but hope to get there.