If you want to be thin, train the 肛筋.

Book (Practical) Living If you want to be thin, train the 肛筋.

※Please note that product information is not in full comprehensive meaning because of the machine translation.
Japanese title: 単行本(実用) 家政学・生活科学 やせたいなら肛筋を鍛えなさい
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Item number: BO1996290
Released date: 27 Jul 2017
Maker: KADOKAWA
著: 久嬢由起子

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

Home Economics and Life Science
Lifestyle and Living
Only 24 seconds a day! Relax! Train your anal muscles and let them relax! The ultimate "anal sphincter" method by Dr. Yukiko Kujo, who is a certified manual therapist training instructor. By training your anus, you can expect diet, beautiful buttocks, and anti-aging effects. Anal stretch books.