You and a friend set an exercise goal to run for 40 minutes without stopping, as you are just beginning to train for a marathon.
Upon beginning the run your friend breaks out into a sprint! What rational below would lead you to run at a comfortable, steady, pace and not follow your overzealous friend?
Most people start to face new issues at the ages of 11-13 some may gain this at older ages, but it typically starts around that time, some causes of this are: Puberty;School; Problems at home; etc.
