But medicine isn't just about pills and operations. Where do you think knowledge of those "healthy lifestyles" came from?
Regarding the most of what you said, any healthy adult should be able to accomplish those tasks. Except the foot behind the head thing. That's just freaky. 
I can do more funny positions than just that. I think it was funny that one time in the gym when I was sitting oddly stretching and 2 heavier men walked in and I heard them say from a distance "he's flexible"

and I got the impression they were surprised. Also, normally, people would have to have no fat or muscle to be that flexible.
Look at the bright side though. If I continue to maintain flexibility and balance when standing with one limb with different positions, as well as use of coodination and it will help when I get old.
Achieving total balance in abilities and strengths physically and mentally is the way to achieve the ultimate people who would need the least amount of help from others, even as the person ages. It saves a lot of resourses, boosts confidence, longevity, being able to do almost all on your own without aid from others, etc, when combining the abilities all together. One ability and area of strength doesn't do much good if one cannot combine it with other abilities. Kind of like having brute strength doesn't do much good if one doesn't have brains or speed, stamina, and inner strength to combine it with.
If one can become like that, one need not have health care, or maybe just have some just incase of an accident since it is good to be safe than sorry and be careful and always prepare for the worst, which is why pessimists seem smarter and wiser than optimists.
Speaking of, It's hard to do the Matrix pose of bending the back but I can do it pretty well. But I talked about myself again, but only because you said "Except the foot behind the head thing. That's just freaky.

"
Time for bed now. I have work to do tomorrow and I should break that habit of staying up too late pretty much every night and sleeping too late.