Barefoot running efficiency

Is barefoot running more or less efficient than running in shoes?

Who cares?! Barefoot is fun! And we think barefoot is good for you, too.

Besides, the recent studies that say barefoot is less efficient are riddled with holes (including that one only showed that "barefoot-style" running was less efficient for people who had no experience with it!

Anyway, I think this equation sums up the benefits of being barefoot or in Xero Shoes ;-).

And since it's math, you know it must be true!