When the torso rises abruptly, it causes a “drag” effect that immediately stops the body from accelerating in push mechanics Saquon might’ve had a slower 10, but continues to accelerate and hits his fastest speed closer to the end — final result: 4.40 David hits top speed early (when he pops up) which causes him to decelerate early and run slower— final result: 4.50 While acceleration is a skill, and max velocity is a skill— you have to teach seamless transitions to prevent athletes from compartmentalizing these skills into two separate phases. If you look at the 40 as a whole, the “transition” happens naturally as you move from a horizontal push to a vertical upright posture when you can no longer apply force behind the center of mass To keep it simple, push yourself down the field until your hips catch up with the torso (chase) and continue to push yourself taller as your finishing. Hope this helps !! #nflcombine2019 #nflcombinetraining #speed saquon mambasportsacademy