I envy all runners. I tried running many times, on consecutive days as well. After running for a minute or so, I start getting a burning sensation in the chest and I gasp for breath. I must stop and sit. After resting for a few minutes, I can repeat the same. However I can do fast walking for an hour. I suspect this is some condition that I have, rather than lack of practice. So I don't push it. Anyone thinks this is normal? Also I'm not sure if running for longer time is so much needed if I do walking.