I joined a local bike club and been on 3 group rides. I noticed that many of the veterans have what appears to be bowl legs. So I wondered if this is common to people who put on a great deal of miles on bikes or a coincednce. Their legs do not go straight up and down as they go out and up when they pedal. If something common to biking I wonder if it is due to poor technique, poor bike fit or simply what will happen to me if I put enough miles on my Bike.