Endurance versus Sprinting. Aerobic (>15 minutes of 60% effort usually) or Anaerobic ( <45 seconds of ALL our 80-95% effort). Primary muscles are Glutes, Quadriceps, Calves, Hip Flexors, and Core. This video aims for the MTNTOUGH Athlete to analyze their ability to run biomechanically. The critical difference biomechanically that you will look for from the rear and side angles is the knee flexion angle. Jogging the knee will be approximately 45 degrees relative to the hip and more vertical or upright body. As for sprinting, the knee will be around 90 degrees in relation to the hip, and the body will lean forward until the runner reaches maximal speed (40-60 yards). It is essential to be a mid-foot runner when sprinting, with less braking, to maximize force production and tempo or turnover of your foot strikes. When videoing your jog, it is essential to have a rhythm or cadence of 180 (+/- 10 beats per minute). Apply the appropriate exercise prescription to turn your weakness into strength if you find a deficiency.