筋トレ

https://www.youtube.com/watch?v=Tpnx1tgQReo

https://www.youtube.com/watch?v=KhxFvg9bK4s

https://www.youtube.com/watch?v=vfx27pO7Ock

重量×回数×セット数が重要

https://www.youtube.com/watch?v=yOimbN0WQRY