I ask my 70-something friends all the time why they don't at least walk...and I get the same answer.
"I don't like it."
With what we now know about diet (keto) and exercise, there is no excuse for being overweight or in poor physical condition. It is mind-boggling that people won't take steps to prevent illness and pain that comes from bad habits.
You can mimic some of the cardiovascular effects of exercise by using a sauna with cold showers. Plus getting a oxygen therapy.
These don’t help with muscle mass