Most Helpful Girl
I assuming it's because it's similar to swinging like a monkey in a tree or some shit.
Most Helpful Guy
Most likely because it's an overhead, overhand climbing method that resembles primates moving through the trees.
Because they were associated with swinging like a monkey.
Because it's the kind of thing a monkey would enjoy.
There used to be a toy, years ago, that was a monkey attached to parallel bars, by elastic string, and when you pressed the base of it, the monkey did athletic moves on the bars.
HM saw a black kid swinging on a metal bar and decided it would be great for kids. Hence the name 'monkey' bar.
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