Chunkey Monkey Foxes
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Yinrih are arboreal animals. Their limbs are built to pull their weight against gravity and are naturally dense with musculature. This is a trait made obvious with healers since they have no fur.
The surface-dwellers of Sweetwater tend to have more body fat than other yinrih, an adaptation to their marine environment that allows them to swim more easily. This makes them more prone to obesity, especially when living off-world.
Calmwind, the IT admin from one of my stories, is either a Sweetwater immigrant or a descendent of the same, partially explaining his stoutness. IT, especially medical IT, can be stressful work, and he may be self-medicating with food.