That would be impossible in a suburban setting; at best, one of these destinations would be within the theoretical waking distance, but without the walkways.
Not necessarily true. The "village center" idea Jim Rouse used in his design of Columbia, MD could be used to solve the problem.
All of these things are within walking distance if you live in Columbia's village of Wilde Lake (and, of course, your health insurance covers the primary care physicians in walking distance).
I'm guessing you're thinking of typical "stroad" suburbs, but alternatives are possible and do exist.
Unfortunately, the suburb has to be the product of planning like Columbia. Typical "emergent" suburbs turn into unwalkable ones.
If you want public health outcomes, actual scale, you get much better outcomes by not having that regulatory system at all.
The original reason for low population density was agricultural work, which - even in the early days of mechanisation - was plenty physical.
Living in exurbia to work and consume like a city dweller is a new kind of stupid.