system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What part of an explosion actually hurts you?

I know when say a grenade goes off, the shrapnel of the grenade itself is what does most of the damage.  When there is an explosion though is the heat doing the damage or is it something else?  If it is the explosion itself how exactly does it do it?
gpt
It's the pressure from the shockwave.  When an explosion happens, it creates a large amount of outward force that shoves all the air away from it.  This wave of moving air exerts a lot of pressure on anything it hits.  Now, you may think air is soft, but have you ever been in a pillow fight and gotten hit really hard?  Now imagine that same pillow, but being swung by the Incredible Hulk.  That's how hard the shockwave from a big explosion hits you if you're close enough.