Olympic Sliver Medalist, Galen Rupp, does a weight session to prepare for the final 400 meters of the 10K and 5K. Rupp's Coach, Alberto Salazar, explains that last lap speed is the only way to win a medal. Rupp showed his last lap speed in the 10K at the Olympics, but now does Galen have enough left to repeat that performance in the 5K.