Well, for one thing, as people have pointed out, bikes can be transported so if it's a GPS unit it will read the distance/speed of the drive to the start of the ride and the drive home as part of the ride. And frankly, it's no big deal to push a button. When I ride, I have to turn on all my bike lights, so activating Strava at the beginning of a ride and then shutting it off at the end is no big deal.