The writer seems to be speaking from the narrow and insular view of a healthy able person and is solely addressing an audience of healthy able people.
What about the sizable subset of people who have illnesses, disabilities and age-related complications in which a good old sweating workout isn't an option? Some benefit is better than none.
And being on disability isn't much of an income - and health insurance, well, we know how bad insurance has gotten.
I want quality of life and not longevity if it means living in a nursing home draining money from the people and family's inheritance.
I once read that 20 percent of the population is disabled. Don't know how accurate that is, but that's a sizable percentage. (1 out of 5).