You edited and added that after I posted my comment, because that was not there when I wrote my reply.

But regardless, I still disagree. You seem to be assuming that early risers don't want to do outside activities, but that is not true. There are plenty of people that go for a run or jog, or morning hike, etc before work. At a previous company we had a rock climbing club called, "Get High in the Morning" :-D