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It was around four to six million years ago when humans first evolved to walk upright.
Here's the Latest Research on Running Form
Barefoot Running: Conspiracies and Controversies
Barefoot Running: New Research On The Science - Outside Online
Barefoot walkers have tough feet but sense the ground just as well
Barefoot v. Shod Running Essay - Endurance running is currently among one of the most popular sports - Studocu
The Science of Barefoot Running Shoes
Running barefoot eases impacts: researcher
Is It Really Better to Run Barefoot? Another Major Study Just Weighed in : ScienceAlert
Woodstock Man Breaks Guinness Records Running Barefoot
Fact or Fiction: Barefoot Running Is Better For Your Health
Foot strength: behind the science