GSP was also one of the people who turned me on to gymnastics fitness training. I hope you are incorporating resistance work to maintain muscle mass as you experiment with different lifestyles. I'm sure you are familiar with the hazards of muscle wasting as we age, as well as the positive metabolic effects of continuous muscle stimulation. Try mastering a handstand, which is something I have been working on myself. It is very satisfying. I can even do several hand stand push ups. Pistol squats are another gem, and help fortify the knee joint for hiking and running.