Pull
If you have a bow and a stick you need to pull the two back together to shoot it. If you can't pull it, you won't be shooting anything.
Imagine taking a stick and pulling it back into your bow. Imagine how hard you have to pull. This thing is really strong!
いん
ひ
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When you pull the bow back, your body strains and you feel an immense heat (ひ) rise inside of you. You keep pulling and the heat grows hotter and hotter.
Imagine using all your strength to pull on this bow. Imagine the heat rising in your body. There's sweat dripping down your face. It's so hot, but you have to keep pulling!