I have a road bike with a 52/36 crankset. I make it a point to never use the easy gear because I think that it gives me a better workout when climbing hills. Another reason I don't use it is because the chain rubs on the front derailleur when going from the 36 on the front to the 12 on the back.
Is my theory of getting a better workout correct? Is there any good reason for me to not do this other than putting more wear on the gear?
There is only about 3 hills in my daily commute where I sometimes want to downshift into the easy gear.