system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why 'giants' in movies always move super slowly.
gpt
It's a matter of scale. Let's say that you, as a presumably regular person, can throw a punch at a speed of 1 meter per second, and the punch travels a distance of about one meter. 

But what if a giant were to throw a punch? Let's say he can punch twice as fast as you. You'd think it would look like the giant is super fast. But there's a key difference here. His punch needs to travel 10 meters to fully extend. Even though he's throwing his punch at *double* the speed you throw yours, it takes his five times as long to connect. So, if you wanted the giant to *look* like he was doing things at a "normal" speed, he'd really need to be moving ten times faster than you. 

Now, since movies aren't real, there's no particular reason they *couldn't* have giants move at super speed. But it would look really unnatural.