1. Linear AccelerationLinear Acceleration
PresentationPresentation
Cade JonesCade Jones

2. Acceleration Error ModelAcceleration Error Model
 Avoid Excessive Trunk FlexionAvoid Excessive Trunk Flexion
 Monitor Backside Ankle Mechanics (NoMonitor Backside Ankle Mechanics (No
Collapse)Collapse)
 Ensure Proper Backside Hip ExtensionEnsure Proper Backside Hip Extension
 Develop Efficient Initial Contact withDevelop Efficient Initial Contact with
Ground (No Deceleration)Ground (No Deceleration)

3. Subject: Corey CampbellSubject: Corey Campbell
 Develop appropriate linear accelerationDevelop appropriate linear acceleration
starting position to optimize accelerationstarting position to optimize acceleration
speed and mechanicsspeed and mechanics
 Lower Pre Test start timeLower Pre Test start time
 Develop good first step qualityDevelop good first step quality
 Monitor Front Side Knee Mechanics andMonitor Front Side Knee Mechanics and
Stride LengthStride Length

4. Individual AnalysisIndividual Analysis
 Eversion/Pronation at the ankle and footEversion/Pronation at the ankle and foot
 Hip RetroversionHip Retroversion
 Utilizes Frontal Plane MovementUtilizes Frontal Plane Movement
 Large First StepLarge First Step
 Greater Angles of Knee and Ankle FlexionGreater Angles of Knee and Ankle Flexion
during starting positionduring starting position

5. Start PhaseStart Phase
 Longer Ground Contact Time (0.12-0.18s)Longer Ground Contact Time (0.12-0.18s)
 Forward Velocity is Relatively LowForward Velocity is Relatively Low
 Hip and Knee Extension must be wellHip and Knee Extension must be well
coordinatedcoordinated
 Knee Extension must never precede hipKnee Extension must never precede hip
extension in order to ensure optimal forceextension in order to ensure optimal force
transfer (The Ground Reaction force will betransfer (The Ground Reaction force will be
more vertical)more vertical)
 Rectus Femoris is Active, very little hamstringRectus Femoris is Active, very little hamstring
involvementinvolvement

6. Start PhaseStart Phase
 BoschBosch
 ““The longer contact time with the ground makesThe longer contact time with the ground makes
it possible to compensate for rotations that haveit possible to compensate for rotations that have
developed during the previous push-off, withoutdeveloped during the previous push-off, without
needing to reduce the force of the push off”needing to reduce the force of the push off”
 More difficult to preload the muscle, so theyMore difficult to preload the muscle, so they
work less reactively then during speed runningwork less reactively then during speed running
 Mainly Glutes, Quads, and Dorsal MusclesMainly Glutes, Quads, and Dorsal Muscles
during startduring start
 Key is PostureKey is Posture

7. Start PhaseStart Phase
 Force Down and BackForce Down and Back
 Dorsiflexion and Ankle TensionDorsiflexion and Ankle Tension
 Hips must be held low, but requiresHips must be held low, but requires
tremendous forcetremendous force
 Complete extensionComplete extension
 Favorable projection of the body’s centerFavorable projection of the body’s center
of gravity onto the ground in front of theof gravity onto the ground in front of the
point of supportpoint of support

8. Start PhaseStart Phase
 Arm Action in Saggital PlaneArm Action in Saggital Plane
 Pelvis and Shoulders move in the Frontal andPelvis and Shoulders move in the Frontal and
Transverse Planes to support push-off (Wider startingTransverse Planes to support push-off (Wider starting
position)position)
 At the moment of initial contact, the shoulder and the hipAt the moment of initial contact, the shoulder and the hip
are closer together on the side of the stance legare closer together on the side of the stance leg
 At the moment of toe-off, the situation is simply reversedAt the moment of toe-off, the situation is simply reversed
 During short floating phase, frontal plane movement isDuring short floating phase, frontal plane movement is
not necessarynot necessary
 External Rotation of hip and lower leg can beExternal Rotation of hip and lower leg can be
advantageous to acceleration mechanicsadvantageous to acceleration mechanics

9. Pre Starting Position Relative andPre Starting Position Relative and
Absolute AnglesAbsolute Angles
 https://www.coachseye.com/v/c6OFhttps://www.coachseye.com/v/c6OF
 Pre AbsolutePre Absolute
 https://https://www.coachseye.com/v/mwbPwww.coachseye.com/v/mwbP
 Pre RelativePre Relative

10. Pre 5 Yard Split TimePre 5 Yard Split Time
 https://www.coachseye.com/v/epH7https://www.coachseye.com/v/epH7

11. Drill SelectionDrill Selection
 Day 1:Day 1:
 Wall Posture HoldWall Posture Hold
 Load N LiftLoad N Lift
 Wall March Single ExchangeWall March Single Exchange
 Harness Acceleration MarchHarness Acceleration March
 Harness Acceleration Skip/BoundHarness Acceleration Skip/Bound
 Free StartsFree Starts

12. Drill SelectionDrill Selection
 Day 2:Day 2:
 Harness Acceleration MarchHarness Acceleration March
 Harness Acceleration SkipHarness Acceleration Skip
 Pop, Float, and SkipPop, Float, and Skip
 Lean, Fall, RunLean, Fall, Run
 Free StartsFree Starts

13. Drill SelectionDrill Selection
 Day 3:Day 3:
 Harness BoundHarness Bound
 Lean Fall RunLean Fall Run
 Med Ball Chest Pass StartMed Ball Chest Pass Start
 Free StartsFree Starts

14. Drill SelectionDrill Selection
 Day 4Day 4
 Lean, Fall, Run,Lean, Fall, Run,
 Med Ball Chest Pass StartMed Ball Chest Pass Start
 Free StartsFree Starts

15. Post Starting Position Relative andPost Starting Position Relative and
Absolute AnglesAbsolute Angles
 https://www.coachseye.com/v/Sruwhttps://www.coachseye.com/v/Sruw
 Post AbsolutePost Absolute
 https://www.coachseye.com/v/6gUFhttps://www.coachseye.com/v/6gUF
 Post RelativePost Relative

16. Post 5 Yard Split TimePost 5 Yard Split Time
 https://www.coachseye.com/v/kQV1https://www.coachseye.com/v/kQV1