I tested the lack of warm-up suggestion today. Started off slow and increased the pace gradually, to see when, if at all, I feel any pain.
I still felt the pain in the beginning, even though I started gently. Followed it up by full throttle running, but that did not induce the chest pain again.
1. slow walk - 500 meters - no pain
2. medium pace walk - 500 meters - no pain
3. slow jog - 200 meters - pain, had to slow down
4. medium pace walk - 300 meters - pain subsided
5. full throttle, maximum speed - 100 meters - no pain
6. alternated between "medium pace walk" and "full throttle" several times thereafter - felt no pain ever again
P.S. - If you can run 40min a day 5 days a week you are doing well
Thanks. it isn't usually 40 min of continuous running, if that's what you thought. I mix up walks/jogs/runs in that period.