You would have to pay for not only your healthcare, but any civil damages to someone who was harmed or had a loss of life because you were occupying a bed they needed for a non COVID related malady [1].

Exercise should be prescribed, but not mandated. The overweight and morbidly obese are not overloading medical systems, so it is less of a pressing concern.

[1] https://abc7.com/us-army-veteran-daniel-wilkinson-michelle-p... (US Army vet's mother demands change after son dies of non-COVID illness while waiting for ICU bed)