This practical book introduces 30-second stretching methods to improve lower back pain, stiff shoulders, and knee pain. - Title: Goodbye to Lower Back Pain, Stiff Shoulders, and Knee Pain! 30-Second Stretches - Author: Kazuya Oida - Publisher: Kaihatsu-sha - Followers: Over 300,000 - Recommender: Hakubi Muto - Price: 1300 yen - Pages: Approximately 160 pages Thank you for viewing. This is a used book. Please refrain from purchasing if you are concerned about the condition. Thank you.