Reading a book while listening to music totally is good for you. Just not the same way physical exercise is. My suggestion is to find a level of exercise you find palatable. Once a week I do a loop around a local park, partially run partially walked. I also walk (without running) once or twice a week.

The reason I don't do it daily and the reason I don't always run is because I know I would just quit working out instead of continuing my regiment. So, that's the best for me. Find an amount/location/pace of running that's palatable to you and try to stick to it. Only increase the workout if you don't dread the idea.