One of the reasons I posted this is a trend I've noticed on my group rides. I can't use BMI to predict who is in the A group (~20 + average speed) but If I used it to exclude folks, I would be correct except for 2 folks out of the 20 or so that regularly ride. Of the 2, I'm 1 of them. I can tag along with the A group on a flat ride, in the hills I get dropped and have to catch up at store stops.