This is a practical guidebook specializing in core training. - Title: Core Training to Improve Core Strength - Content: Describes specific methods and precautions for core training. - Training Types: Inner, Outer, Synchronization Training - Publisher: Seimido Publishing - Language: Japanese ① There are lines on the cover. ➅ There are also lines on the back cover. ⑦.⑧ The book is slightly raised. I erased a name written on the back cover with nail polish remover. Please refrain from purchasing if you are looking for a perfect item or are overly concerned about condition. I will use materials I have at home for packaging.