No writing or tears are visible. There is some staining on the first few pages. The cover is attached with double-sided tape. The DVD has been opened but has never been watched. Speed is a necessary skill in most sports. "Just doing hill sprints will be good," "Just doing strength training will make you faster." Of course, you'll get a little faster. But to make your legs faster, there are many things to consider, such as how to move your legs, how to swing your arms, and awareness of your upper body. This book explains the detailed skills that are difficult to acquire just by running.