DVD that teaches a method of core axis adjustment using a chair. Purchased this item after it was viewed only once. I also watched it once. Afterwards, I participated in a workshop and no longer need it, so I am selling it. - Title: ISUJIKU-HO Quick Core Axis Adjustment DVD - Contents: Demonstration and instruction on core axis adjustment methods - Format: DVD - Language: Japanese - Target Audience: Health & Fitness - Supervision: So Nishiyama - Content Summary: Practical guide to core axis adjustment using a chair - Running Time: Approximately 50 minutes - Retail Price: 5500 yen (tax included)