Qi Gong has well-documented effects on health. It also appears to have a positive effect on telomerase (the enzyme that protects telomeres) in two studies so far.
Be a vegetarian on Tuesdays. Or try it for a week at a time. If you have had a period of being meat free that totals at least one month, you have saved animal lives and reduced your carbon imprint. This Vegetarian Calculator helps to show your positive effect.