Unused as I purchased it by mistake. A must-have book for learning the correct way to use a bicycle. [Title] The Bicycle Textbook: How to Use Your Body [Author] Ryosuke Kakine [Publisher] Shogakukan [Content] Contains information on the correct way to use a bicycle and how to use your body. [Features] Evolution never stops! Content that overturns common sense about bicycles. Thank you for looking.