Villagers that don't do exercises?

[AccfSally]

So, I have Hazel on my island and I have never seen her do any type of exercises.

Sylvana also seems to only do yoga.

Is this an error or just something unique?

 

[lPeachy]

It’s not random, it’s based which hobbies they have. All villagers of all personalities have a secondary hobby that influences what they do around town/how they act.
Here’s a handy resource to find out which villagers have which hobbies!