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I spent hours a day juggling for ~4 years in my mid teens (in my 30s now) and got up to juggling 8 balls.

I find numbers juggling (say 5 or more) to be almost therapeutic. It requires a reasonable amount of physical exertion, and it just pulls you into a flow state. All of your mental and physical focus is concentrated on maintaining this ephemeral pattern, and there's no room for anything else... until the pattern falls apart :-)

Probably. When I lived in the bay area, I juggled at the San Francisco circus center: http://circuscenter.org/juggling and there's also a juggling club in Berkeley: https://berkeleyjuggling.org/ Many jugglers I've met there worked in IT/software-related jobs.

There’s at least a few developers that juggle. I’m one.