system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are giants always shown as being so slow in movies? I know they would be heavier and need to move a lot more weight, but don’t they have the proportions of a normal person? Their muscles would be bigger allowing them to move at a normal speed.

Sorry if this is stupid. It’s just been on my mind for ages.
gpt
In movies, it is because it looks right. But it is also realistic, due to the 'square-cube law' - that strength increases by the square of length, but mass increases by the cube. So you'd expect animal 3 times bigger to be 9 times stronger, but 27 times heavier - proportional to it's mass, the bigger animal is 1/3 as strong.

This is why small fleas can jump so high, but elephants can't jump at all.