I have never been into biking that much, I have always been more of a jogger. I do about 15-20 miles a week jogging. Most of my bike rides are about 5 miles and on flat terrain. However, I want to start riding more than I jog. My current bike course incorporates hills and I am doing about 9 miles per ride. That only takes about 1 hour. I really dont feel like I got a good workout. I will be riding 4 times a week. How many miles do you think I should ride ? I was thinking I could manage 15-20 per ride with the hills and not be too pooped. What do you guys think ? How many miles do you guys ride per day or week ?