Shinsu: Abilities

This also applies to Body Reinforcement (신체강화, 身體强化 , shinchae gahnghwa; or "Physical Enhancement"). Every living organism within the Tower has an individual flow of Shinsu. By using this flow, one can heal themselves or others, enhance their physical capabilities or grant numerous other abilities. Of course, the opposite is also possible. If you strengthen or speed up the flow of Shinsu within your own body, you can strengthen and speed up your own body, but you may also inflict a proportional amount of internal damage on yourself. This also applies to others. If you control your enemy's flow of Shinsu beyond its limit, your enemy will be reduced to nothing but a sack of skin, like a popped water balloon.
-SIU blog