Copenhagen Marathon 2008 / rKistian
When you begin running, discomfort in the chest is caused when your body isn't warmed-up.
Make sure to take the time to warm-up properly.
Pain in your side is caused when your spleen contracts after meals.
Avoid running right after meals and begin running after warming-up.
If you feel pain, slow down your pace and speed up again after your muscles have become warmed-up enough.
