Since I am new to commuting and still building up my speed and fitness..I fall back when someone passes me. I don't know why...I guess I just don't want them to think I am trying to race them.

I've had to pass a couple people before though too. When no other bikes are close..I push it..and try to develop techniques I read about to increase my speed. Right now I am practicing lifting my opposite knee on the downstroke.