Many thanks for your help. I have bought a new bike with a proper fit and I has made a world of difference. I was riding a 12 year old mountain bike from walmart. Now I'm on a trek 1.1....NIGHT AND DAY, let mentell you. But on the new bike I'm more comfortable. I have been paying closer attention my cadence and it really does make a difference. I didn't realize that I was pumping hard when I should have pedaling faster. Again thanks for the advice.