NIH: "Only Half of U.S. Youth Meet Physical Standards"

And those standards aren't so high.

What ever happend to the President' Council on Youth Fitness?  Ike introduced that program in the mid-1950s.  I clearly remember our phys ed teachers talking about it.  It had a very important impact.

Well, it's morphed into something else.  And our phys ed programs in the public schools are being cut.

If, however, we fight our wars with drones from an easy chair and a joy stick, what difference does it really make?  Right?

We will become like the dreaded Kaldanes in Edgar Rice Burroughs, the Chessmen of Mars:

[T]the Kaldanes are almost all head, but for six arachnoid legs and a pair of chelae. Their racial goal is to evolve further towards pure intellect and away from bodily existence:

It is only your brain that makes you superior to the banth, but your brain is bound by the limitations of your body. Not so, ours. With us brain is everything. Ninety per centum of our volume is brain. We have only the simplest of vital organs and they are very small for they do not have to assist in the support of a complicated system of nerves, muscles, flesh and bone. We have no lungs, for we do not require air. Far below the levels to which we can take the rykors is a vast network of burrows where the real life of the kaldane is lived. There the air-breathing rykor would perish as you would perish. There we have stored vast quantities of food in hermetically sealed chambers. It will last forever. Far beneath the surface is water that will flow for countless ages after the surface water is exhausted. We are preparing for the time we know must come -- the time when the last vestige of the Barsoomian atmosphere is spent -- when the waters and food are gone. For this purpose were we created, that there might not perish from the planet Nature's divinest creation -- the perfect brain. 

-from the Wikipedia article on the Kaldane. 

Except, somehow, I don't think the rest of the world is going to sit back and let us evolve that way.  You see, we have this nice lunch set before us every day, and the rest of the world wants to eat it.

Besides, John Carter made short work of the Kaldanes.  He had a terrific body and knew how to use it.  (His girlfriends weren't half bad either.)