Well done Chris. On my first ride 4 years ago, my asthma was not controlled at that time. I rode 200 yards and had to stop to catch my breadth. My allergist now has me on some good stuff that controls asthma very well and can do 50 or more mile rides with relative ease. Your mileage will go up of its own accord as it responds to the effort of riding. Recovery is important so ride as often as it feels good. If you ride often enough so that it doesn't feel good, take a day or two off. If you reach this point you will know it as your legs will feel as if they have no strength.