筋トレyoutuber界のsyamu説明面倒くさいんでこちらで、どうぞ↓ https://itest.5ch.net/test/read.cgi/muscle/1615195362/l50https://youtube.com/channel/UCrHVDHdrQT_JaOorO1Fa8Nw
http://www.nicovideo.jp/watch/sm38945740