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Depends what else you cut out, for instance I would add commuting in there. If you prioritize living close to work (or working remotely) then exercise can be your commute. IE Run or bike to work. Or if that's not an option do a karate class or get a climbing gym membership with your kids and exercise while spending time with them. Combining things you want to do is a great way to check off more things on the list.

A good way to look at it, but you need to add "get remotely enough sleep" to your "choose 3" list. :)

lol, how do you offload "having a social life"?

You stop going to social events. It's not hard (or rather, the reasons it's hard are not the practical difficulty)