Every sports motion that involves hitting or pitching has
to obey the correct Kinematic Sequence.   Tim
Linsecum (above) and Andy Roddick (right) are two
great examples.
On Roddick's tennis serve, he has begun to turn his
shoulders toward the target as the hand lags behind.
His racket will eventually snap through impact much like
a cracking whip.
I loved Ben Hogan.   He is my all time favorite player.
I was very proud to work for his company from 1996 until he died in 1997.
One of my favorite Hogan stories is about a young tour player who got
up the courage to ask Hogan about the "key" to his downswing.  This
happened while Hogan was having lunch at his Club in Fort Worth.  
Bar
ely looking up, Hogan looked at the player and asked: "Do you have
a perfect back swing?"  The player said he was working on it.  Hogan
responded: "I will talk about the downswing after your back swing is
perfect."
The moral of this story is that studying the downswing is most valuable
after you have perfected the back swing.   That being said, lets have
some fun and look at how power is created in the downswing by your big
muscles.
April 2011 Newsletter Tips   How to use your big muscles correctly.
I have been certified as a Golf Biomechanist (Level 2) from the Titleist Performance Institute.  If you will hang in
there with me, I would like to explain a huge breakthrough in Sports Training called the Kinematic Sequence.   
Thanks to the invention of 3D Body Motion Scanners, we are now able to measure the movement of the key
muscles groups in the body   Please look at the chart below.  Four key segments are represented by different
color lines:  Red is the Pelvis area (hips), Green is the Thorax area (shoulders), Blue is the arms, and Tan is the
club head.   
The chart's graph represents the selected areas speed of rotation in degrees per second at the different stages
(time) of the golfers swing.  

Here are the key things to study:
1.  At the beginning of the downswing the four segments start to accelerate at almost the same speed.

2.  The Hips (red line) reach their peak rotation speed about half way between the top of the back swing and
impact.  Then the hips start to slow down very rapidly.  The rapid slow down indicates that they have stabilized.

3.  As each segment stabilizes it actually accelerates the next segment.
Please look closely at two time Master's Champion Bernard Langer's swing above.  I have drawn a red line up
from his left toe.  As he starts his downswing you will see that he has shifted his weight slightly and that he is
clearing his left hip back away from the ball.   The whole left side is like a wall as he swings through into perfect
balance.
He is demonstrating a perfect Kinematic Sequence.
I have a computer the academy called a Body Motion
Sensor.  It can measure your rotation of the hips and
shoulders to determine if you are swinging in
sequence.
It also measures the speed of rotation of those key big
muscles.
Next time you come for a lesson make sure you ask to
be measured on this machine...it is a lot of fun.
The picture above of two time World Long Drive Champ Jamie Sadlowski shows dramatically
how in frame 5 his hips are stabilizing while his arms are only half way down to impact.