In this video from the NSCA's Personal Trainers Conference 2013, Brad Schoenfeld, MSc, CSCS, CSPS, FNSCA, discusses the benefits and mechanics of squats.
Personal trainersCoachesExercise TechniqueProgram design
Two factors that determine running speed are stride cadence and stride length. Because athletes propel themselves forward only when their foot is in contact with the ground, the stance phase of the running stride should be the focus of speed enhancement programs.