I started doing spinning last winter and am spinning now. What I've discovered is that I breeze through the classes. I even keep doing higher resistance and/or higher rpms and yet it's not that hard for me. But, when I get out on the road and do those first hills I am slower than everyone. Part of it is that I can't lose that extra 10-15 lbs and part of it is I'm 60 yrs. old and had a layoff from age 52-58. At least I think that's it. Any insights?