For thousands of years, humans have lived barefoot or with a basic level of protection to their soles. Running barefoot
Cushioned Shoes or Going Barefoot: Which is Better for Running?
Do Olympic games require track and field athletes to wear shoes? - Quora
Should I be running barefoot? - Quora
RUNNING BAREFOOT VS. SHOES
Is Barefoot Running Better? Or are you Running Toward Injury?
Studies tackle the myths of fleet feet
Barefoot Running: Exploring the craze
Can you personally run faster barefooted or in shoes? - Quora
Running Barefoot: The Pros and the Cons – The Olympians