plz tell me some good type of yoga to improve breathing system
Re: yoga for breathing
agar aap ke pass waqt hai: Try Tai Qi, (Yang style or Wu)
hummm agar waqt nahi hai, just try to sit still at the bottom of the pool.
Re: yoga for breathing
OP, google can help you better 
Basics about Yoga are moderating your breathing manner and make it deep and stable.