if the states aren't obvious, use an enum with two values, and name them both. Thats what enums are for.
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Other states are irrelevant only the true condition implied matters, it is or isnβt that one state.
is_person_standing, is_standing, bStanding all tell you if someone is standing or NOT standing. Nothing else period. It does not matter if there could be other states as the test is one specific case.
One should not use boolean just because variable has only two states.
I believe when you use boolean when enum should be used is called "boolean blindness".
Eg: isFemale instead of enum Sex {MALE;FEMALE} It also gives you an option to simply extend code if requirements change and there are more than two options.
In your example, it's implied that any pose other than standing is irrelevant in that context. Why do you need to care if you don't need to care?
It shouldn't matter if the user is leaning or jumping or whatever. If the variable says "is_person_standing" then the only information I get out of it is whether the person is standing or not. It would be much simpler to use enums to represent the state if there are such other options. If you don't have enums in your language, then use constants.