体幹のお手本は赤ちゃん!? https://mystance135.com/%e4%bd%93%e5%b9%b9%e3%81%ae%e3%81%8a%e6%89%8b%e6%9c%ac%e3%81%af%e8%b5%a4%e3%81%a1%e3%82%83%e3%82%93%ef%bc%81%ef%bc%9f/