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air jordan pas cher  let's go into what constitutes proper acceleration mechanics so you know what to look for with your athlete. Being able to cue and make corrections to your athletes form is what is really going to make these drills successful.  A Breakdown of Acceleration Mechanics and Other Considerations  1) Stride Length = Short to Long Starts off short and increases until maximum velocity is reached (when the stride length is optimal)  2) Ground Contact Time = Long to Short Ground Contact Time is the amount of time each foot spends on the ground. It is longest at the beginning as the body is trying to overcome inertia, (the weight of your body fighting gravity) to try and create velocity through force application. This takes a great deal of strength.  3) Shin Angle with ground = Small to Large The shin angle is going to determine the force application to the ground and the projection angle that the athlete is going to drive out at (roughly 45 degree projection angle is ideal). The shin angle opens up and increases throughout acceleration and into maximum velocity.