A stretching book featuring a 4-week program to improve lower back pain and flexibility. - Title: Split Stretch - Author: NPO Japan Stretch Association - Program Duration: 4 weeks - Contents: Improvement of lower back pain, increased flexibility, mood enhancement, etc. - ISBN: 978-4-8002-6238-7 There are some areas with slight wear. Please check the 10th photo. Please refrain from purchasing if you are concerned about the condition, as it has been stored at home and shows signs of use. Thank you for looking.