I've also wanted to increase my miles. It got too hot to do this, it worked to break the longer ride into 2 pieces, one in the morning and the other in the afternoon. So I think when it starts to get cooler, and it has this week already, I will try to do this. All through my riding, I feel pretty good, no sits bones or leg soreness issues. My lungs feel the workout the most, and I have to use the inhaler before each ride. But hopefully that will also go away as I get more fit. Since I started riding in April, I have shaved a few minutes off my time.