I'm the same age as Uri Hofi, but I started forging much earlier, beginning in 1963. I was presenter of a smithing workshop at Haystack School in 1981, and one of the students, Mary Greene, showed us a ChengManChing tai chi chuan short-form, and said that anyone interested could meet daily before breakfast for an introduction. When I returned home, I found a teacher who worked with the same form.
I have been doing it ever since. It has to do with deep breathing and relaxation. It's good to do before breakfast. Much later, I learned a related method called Chi Kung (Qi Gong). Now I do both. I think it has helped keep me going. I will be demonstrating some of it and talking about it at a St. Louis workshop for BAM, November 21-22.