Showing posts with label center of mass. Show all posts
Showing posts with label center of mass. Show all posts

Sunday, April 1, 2012

Whip The Hip!

Rotational movement integrated with precise timing/sequencing
of the hip and glutei muscles will help give you the elusive power
you seek. So few people understand how to rotate at the hip and
engage the glutes with powerful contraction combined with rear
foot plantarflexion.

This lack of sequencing and movement patterning means a loss of
durability and inhibited optimum performance. Lack of ‘hip whip’
manifests itself in too much muscle recruitment from the upper
torso and the client will ‘bleed’ unproductive energy. It is a term
that represents the motion of powerful active contraction of the
glute with rotational power of the hip joint.

It’s the ‘snap’ of activation with intent of movement that counts.
No sloppy follow thru .The rear leg should have a tense activated
glute and the rear foot should be plantar flexed with minimal
weight resting on the ball of the foot. I tell my clients if I walked
behind you and hit that butt I better bounce off. No loosey
goosey!


Don’t worry about the front leg glute. That will be activated
because you are standing on it with more transferred weight. Pay
attention to the rear leg. Try the rotation without active glute
contraction and then with contraction. Tell me what difference you
feel? You feel much more powerful and stable right? Take a look
at this picture below to see a representation of an end phase ‘hip
whip.’ This is a high stability, loaded movement pattern. Top of
the ‘food chain’ in the 4-stages of owning the whip you will see
listed below.

The glutes are really nice to look at I know, ( well some are) but
the important thing in performance is how they function. Can
they activate? Can they sequence? You may need to spend time
teaching clients how to disassociate the top and bottom of the
body first and then move into locking in transitional patterns.
Start with no load and then increase to resistance bands, and
finally cables.

If you can master the power of the hips and glute you will
unleash the secret weapon of performance. All things being
considered you must own the ‘hip whip’ by progressing thru 4
stages.

1. Insure adequate mobility is on board in the hips. Particularly in
extension and internal rotation. Look for asymmetries.

2. Fascial snags and glutei trigger points must be released and
addressed because they will cause soft tissue extensibility
dysfunction and loss of mobility.

3. Glutes must be activated in relationship to the calves and
iliacus Glutes are often inhibited and weak in relationship to
facilitated calves and iliacus. Release the iliacus by manual
pressure and foam roll the calves, followed immediately by supine
hip bridges to activate the glutes. Be careful of doing the wrong
thing to the psoas. It is often tight and weak, indicating a need
for stretching then immediate strengthening. Simply stretching a
tight and weak muscle is asking for TROUBLE!

4. Movement patterning and motor control. Gaining stability of
the hips in static position, then proceeded by dynamic, and finally
loaded high threshold movement so you can lock in the new
mobility with neural control.

Precision of movement. Quality over quantity. Better is better,
more is not better. These are your guiding principles of power.
Now go have fun whipping your hip!

Rodger Fleming, ATC, LMT
Body Awareness Therapeutic Massage
Macon, Georgia

Monday, August 29, 2011

Center of Mass in Hitting

I continue to hear arguments to where the weight of a player should be when they hit a baseball, is it out front is it back. The problem as I see it is not where it is from a philosophical stand point but from a scientific stand point. Can we determine where the weight should be based on biomechanics? Let’s take a look at a picture.



I made a few dots to look at an approximate location of the center of mass, they are in orange. The first dot is where the COM basically started and just after the point of impact the COM has moved back. So the COM is behind the front foot, but the majority of the player’s weight is being supported by the front foot as seen in the picture. So here is the contradiction that gets a lot of coaches and players. We want our weight back, but want it on our front foot. This is where a biomechanical explanation can help. In human movement the center of mass

ybe outside the players body and just because the weight of the player is supported by an arm or leg does not mean that is where the weight really lies. I hope that didn’t muddy the water. Just look at the picture, and then take a look at a few more pictures and in the majority of players that are at an elite level you will notice a trend. The trend will be that the COM is behind the front foot, no matter the distribution of the weight in the feet. Teaching a hitter how to control their Center of Mass both in the Performance Training Arena as well as while performing skills will increase the player’s awareness in space and increase cross over to the field.
I have included a variation of an exercise that is highly COM demanding that can increase a player’s power for hitting and lateral movement. The variation is a speed skater movement added to a lateral box hop. As you can see from the picture the players COM is probably outside the body, the weight is on one foot and moving in a lateral direction. If the players weight gets over the foot or drifts over the foot the player looses balance, just like in hitting a baseball. If the player drifts the player in most cases cant stay balanced which decreases his chances to hit.


Have fun with the exercise and take a look at those pictures and start looking at it from a scientific position and many times the problem will take care of it self.

Brian Niswender MA
Co-Founder Baseball Strength Coaching .com