Study finds Nike and Asics models are the top performance shoes

The difference in running economy between models can translate to four to six minutes off your marathon time

WATCH: How much time do carbon shoes really take off?

Professor of biomechanics at BYU gives his perspective on the benefits of carbon-plated shoes

Meet Aleksandr Sorokin, the man behind the new 24-hour world record

Sorokin spoke to us about his 24-hour world record, how he got into ultrarunning and junk food