Books : Any horror books related to witches from Hell that force people to work out?

Any horror books related to witches from Hell that force people to work out?

Thats what I was looking for to read. Maybe it isnt a witch. Maybe it is some kind of demon like the ones in those Hellraiser movies. They use working out or weight loss as a form of punishment. The victims end up anorexic and and malnourished.

https://youtu.be/iPUwtyZglQI

https://youtu.be/QRTNm6GLJYI
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