A cool feature might be to be able to share activities only with clubs or only with certain clubs. Up to now it has only been possible not to release activities, only to release them for followers or for all Strava users. Releasing activities only to certain clubs would have the benefit of being able to share your activities with your friends and coaches, but leaving your competition out of the loop. In this way, Strava would become a great tool for collaboration between athletes, coaches and training groups beyond its previous functions.