chest discomfort at beginning of a run
Trying to solve a puzzle: I only get pain in my chest when I run, not when I do aerobics classes. If I allow myself an extended warm-up (walking for 15 minutes or so), when I start to run I don't feel the discomfort. However, if I don't allow the warm-up I immediately start to feel the pain (it will subside after 10-15…
