Breathing excercizes and stretches in general are good for you. Breath control is essential to target shooting, and the stretch will strengthen the small muscles for finer control.
I've been doing hatha yoga with my wife, and it's no joke. Very similar poses to tai chi. Yoga is basically the beginning of most martial arts. It's traced back about 5000 years
Some of the lifters were making fun of our class so we invited them to practice with us. Lets just say, they didn't fair that well. Breathing and holding a stretch. Doesn't sound all that bad untill you get a skilled intructor who insists on you doing it right.
Sorry about the derail on the post.
Yes, in my opinion tai chi will be great for you. Wife has been on me to start it too.
Disclaimer: While this post is intended to inform and/or entertain, it may annoy some readers. Read it only if you agree to waive your right not to be annoyed by anonymous internet communication. If you do not agree, please do not read this post or any other signatures by this author.