Seems good idea to me as gets him through the teen years where distractions of drink and drugs will be around and knowing that if he goes OTT then career wish goes as well.
Friends' son keen on sport when he a teen, his mother told him that they would bring him where ever he needed to be................yup many a wet cold sunday morning in January at 9am standing on a football field included that.
Single warning was IF you ever touch drugs then sport is out, leave drink alone until old enough but at Christmas having a beer allowed but not to excess.
Lad now 25 and still at home BUT while goes out on the lash at occasional weekends he has kept away from drugs, as have his sports playing mates.
Kids need a guiding hand to stay on right road with a combination of a gentle push and a big stick in background if needed.
Probably most important think is to ensure you are aware of their friends and their parents. If they have some standards and rules that are somewhere inline with yours then least they see a pattern of behaviour.
Teen in question had pal whose parents were dopeheads, the pal was on it at 14 and less playing sport which meant he could be dropped from circle of friends as no training no football matches etc.
Good luck with it.