system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do animals like squirrels and frogs move like they are lagging?
gpt
We have mostly 2 types of muscles in our bodies. Type 1 and type II

The type one muscles are mostly for endurance. Where as type II allow for explosive bursts. You may have heard of "quick twitch" muscles, which is what animals like frogs and chickens and chipmunks are mostly composed of. These muscles fire rapidly and explosive allowing for bursts of speed and high jumping and rapid directional changes.

When all of your muscles are of the type II variety, you move in a twitchy, jagged manner. Like if everytime you used your arm, it was a karate chop instead of a smooth fluid motion.

Edit. Every single one of you just karate chopped!