Moderator: Van Canna
Stryke wrote:I couldn't get the first clip to work , but like the second , I like the mechanics but personally make them smaller , it is a wave dynamic and a clear weight transfer and double hip , this can be made very internal after a while but nothing wrong with ingraining and doing the mechanic big.
here's a great old clip showing the double hip form Peter Consterdine
http://www.youtube.com/watch?v=tRqfYwhsQdQ
In soccer kicking_
A number of studies have highlighted the importance of the proximal-to-distal sequence of segmental angular velocities in generating a high linear velocity in the kicking foot.
The linear velocity of the kicking foot is highly correlated with the resultant ball velocity.
To generate linear velocity at the foot a skilled kicker will first rotate the hip backward into extension and flex the knee during the backswing phase of the kick.
As the hip begins to flex, the knee continues to flex slightly, and then is held in this position for a brief period as the hip continues to flex. The knee begins to extend before the hip reaches maximal angular velocity, and, as the angular velocity of the hip declines, the knee velocity increases until the foot’s impact with the ball.
Kicking leg kinetics
The kinetic features of the soccer kick are less well understood than the kinematic features. Putnam’s seminal work demonstrated that the kicking movement is characterized by a complex blend of forces generated by muscle moments, motion-dependent moments that result from interactions among joints and segments, and gravitational forces.
Hip flexion moments are nearly twice as large as knee extension moments, and the smallest moments are associated with ankle plantar flexion. The most influential moments appear to be the extensor moment generated by the muscles that cross the knee joint and the moment associated with the angular velocity of the thigh.
The oar acts as the link between the force generated by the rower and the blade force and transmits this force to the rowing shell through the oarlock.
Blade dynamics consist of both lift and drag mechanisms. The force on the oar handle is the result of a phased muscular activation of the rower. Oar handle force and movement are affected by the joint strength and torque-velocity characteristics of the rower.
Summation of force
We already know from Newton’s second law of
motion that the greater the force applied to an
object is, the greater the acceleration. But how
do we create the force to produce this rapid
acceleration?
To obtain maximum force, it is
necessary to combine or add up the forces applied
by different body parts. This concept is known as
the summation of force.
The summation of force is influenced by the:
• number of body parts used in the movement
• order and timing of their involvement
• force and velocity generated
• way in which the body and body parts are
stabilized and balanced.
When a player uses just a few body parts, the force produced will be less than when a player uses many
body parts. This is why the best techniques for throwing, kicking and striking use more than just the obvious
body part that fi nishes the action.
Also important for force production is the sequence in which parts of the body are used. For best results,
movement begins with the larger, slower body parts and finishes with the smaller, faster body parts.
Van Canna wrote:Glad you find it of interest Stryke. I have noticed over time your increased ability to generate power with rotation. Bet you would have found that 'handy' in your hundreds of full contact matches.When a player uses just a few body parts, the force produced will be less than when a player uses many
body parts. This is why the best techniques for throwing, kicking and striking use more than just the obvious
body part that fi nishes the action.
Also important for force production is the sequence in which parts of the body are used. For best results,
movement begins with the larger, slower body parts and finishes with the smaller, faster body parts.
This is what we see in Sensei Nakamatsu's concepts...as Josann wrote, in time those circles become almost invisible to the eye as the rotation explosion happens along the body's centerline.
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