Hey, you know what you should do? Go running. Barefoot.

Really! That's what some, including health researchers, say is best. Daniel Lieberman (pictured), an evolutionary biologist at Harvard University, studied the way sneakers change how people run, and gives barefoot running a full-footed endorsement.

Click through this gallery for a look at Lieberman's unconventional winter footwear and to see other famous barefoot athletes.