brain in this way could unlock potential, offering athletes the key to set new records like the sub two hour marathon. perfect spot on the treadmill. looks good. overcoming mental fatigue is a big focus for the team at nike trying to break the record. i've been breaking a sweat on the treadmill in the sport research lab while bret and brad monitor my oxygen consumption. this is the same test they conduct with their three athletes. >> we'll slow you down now. all right. we'll get this off of you. perfect. a little workout. so we can show you more data on this one. so 185 milliliters per kilogram per kilo so a little bit better than you were. >> so i was better faster. so more economical. >> more economical, faster. and you looked just from vishltly, you looked smoother. you looked like you were kind of