I am 53 years old and in the best physical condition of my life at 5' 6'' and 145 lbs. I lift weights 3 times a week (Group Power) and take 3 cardio classes (Group Step) as well. During the winter I use a Cycleops trainer for my bike. When riding with my friend who runs marathons and also has a compact double, we both run out of gears on hills. This is Western Pa, steep, long hills. In my riding club, most have triples.