When I was a kid playing baseball my father encouraged me to swing a lead weighted bat before a game, the theory being that during the course of the game a regular wood bat would feel lighter in my hands, increasing bat speed. That being said, I use a steel single speed for exercise and save my carbon geared bike for events. Actually it's fun trying to stay with the geared bikes on my daily rides. Obviously I get blown away by serious riders. I have found that when I switch to my geared bike speed is easier and I can control better. Does anyone here train on a single speed and what are your conclusions?