I have a 13 year old step son who wants to start street running training. He's generally pretty good already with fitness (school clubs, football, rugby, etc) and after seeing me recently compete in various 10k and H/M he wants to follow suit which is good.
Whats a reasonable distance to start them on at that age??
was thinking a slow jog of around 2-3 miles once or twice a week. any advice greatly appreciated as wouldn't want him to cause injury.