extreme slow breathing technique, pranayama, TAO breathing?

hello,

i´m interested in learning a very slow & long breathing (dry version / not under water) for medicinal purposes.

my goal is to reach 1 breath per 1 - 3.minutes, so i´d be grateful for any idea or suitable method to reach my goal without suffocation

i ´d like to try learning this: "REGENESIS"   https://www.scribd.com/document/18114563/Regenesis-1

regenesis is a wonderful healing techniques, introduced by a great Mr. Rasmusson http://www.houseofhealinghands.com/RasmussonBob/rasmussonb.html

i think his name shouldn´t be forgotten so quickly.

thanks for any tips!