Hip or knee dominant bowlers have key attractors that guarantee an effective + efficient kinematic sequence.
Here are two perfect examples. (Click Here)
One aspect that is forgotten in the capacity of a fast bowler is the ability to sprint properly with the right kinematics.
I believe the “the jump” is often incorrectly coached and over focused which leads to issue with alignment and incorrect force application.
This is exasperated by an over-reliance on the back squat as a lower body strength builder.
The development of a Knee dominant pattern, increase strength deficit, lack of stiffness, higher SR vertical jump (need to jump up) , static strength, laboured pivot turn on BFC and low reactivity from over-squatting.
Coupled with the incorrect internal cueing of jump high in gather and external cue of jumping over hurdles is destroying the technique of bowling quickly.
Javelin throwers don’t jump high, so why do fast bowlers get coached to jump?
Fast bowling is about continuation of the sprint and the ability to control collision on BFC + FFC by being stiff and avoiding deformation at key joints.
It’s about maintaining acceleration not collapsing on deceleration.
Research shows the higher the speed of COM on FFC the higher the ball VELOCITY.
One key characteristic that I emphasize is the “pendulum” scissor action that occurs between the two legs during the flight phase after BFC.
It’s simply a continuation of the approach. It occurs for both hip + knee dominant quicks.
It reinforces the fact that stride length in sprinting + the delivery itself is a function of generating time specific force at ground contact and the resultant enhanced flight time.
It’s essential that the degree to which the knee of the trail leg passes the hips moving backwards after toe off is limited.
While a more stretched muscle carries greater energy via a longer SSC which would happen with the trail leg extending further behind the hips, it also requires more energy to execute the movement over a greater working amplitude, driving the knee forward.
This motion, leads to a claw back on FFC referred to as swing leg retraction + the posterior-anterior force vector that aids in bowling quickly.
Assess don’t guess