号外/選手の上達ペース!2 https://energy.jp/blog/2011/05/02/%e5%8f%b7%e5%a4%96%ef%bc%8f%e9%81%b8%e6%89%8b%e3%81%ae%e4%b8%8a%e9%81%94%e3%83%9a%e3%83%bc%e3%82%b9%ef%bc%81%ef%bc%92/