For those who want to start running, my advice would be to take it slow and easy. Be patient with yourself. Explore your body's responses. Learn to listen to your body. I took me five years to graduate from running half marathons to full marathons. Now there are large numbers of people in India taking up running and that's wonderful. But many are pushing themselves too hard, trying to run a marathon within the year they start running! Especially in middle age, it can be tricky for the body to get comfortable with that kind of intense effort.