will-
The way the body looks/feels executing the "kinetic link" /summation of velocity to drive a swing primarily by momentum transfer is best understood in golf.
as mic mentions, there are 2 basic golf patterns/chain sequences that are best understood and explained by Jim Hardy.
The KEY determinant of the pattern is how the arms connect to the body through the shoulder complex.
In my opinion, how this is set up and what pattern you use is determined by upper body action in how the loading is done which depends primarily on back arm action/sequencing.
The 2 plane golf swing is similar to the mlb hitting where you coil in a way that creates "a firm front side".
The basic 2 plane golf/mlb pattern involves the synched action of the ends of the body with upper body in control and the torso winds and unwinds between them in response to the arm swing in the case of golf or the handle torque in the case of hitting.
"one piece" feel of the golf backswing is necessary for the 2 plane swing where you want to keep the hands in front of the body to avoid them getting "stuck".
In the 2 plane golf swing, you are coordinating the lifting and dropping of the arms (arm swing) with the turning back and forth of the body (pivot).
You need to keep the arms/hands in front of the body as they swing up and down and you have to have good timing between the up and down of the arms and the back and forth turn of the body.
The 2 plane golf swing has a 1-2-3 tempo where the #2 is when the body coils, similar to the mlb swing where you take an inward turn first without coil, then coil with rubberbandwinidng and then drop and tilt.
In both cases, 2P golf and mlb hitting, you shift the weight and develop a firm front side with the same feel/action/sequence.
The purpose of the "one-piece" golf backswing cue is to encourage the right back arm motion sequence in the backswing to keep the arms in front of the body, NOT letting the arms swing back where they will get stuck.
As hardy says regading golf, there is good one plane information and there is good 2 plane information and there is useless information. The one-piece backswing cue is excellent 2 plane swing swing info, but is NOT for 1 plane golf swing where you DO swing the arms back and forth in the shoulder plane.
The one-piece feel in the 2P golf swing sequence comes from lifting the arms as the body starts to turn back, NOT letting bend at back elbow or wrist **** to get active too early which will interfere with loading and getting the club on plane.
While the lower body and weight shift and coiling are extremely similar in 2P golf and mlb hitting, the upper body loading sequence is very different such that mlb resembles more the loading/windup/"backswing" of the overhand baseball throw/pitch.
Here is the greatest all time pitcher/hitter demonstrating the similarity of his golf and hitting swings, posted here in another thread.
GOTO about 3 and 1/2 minutes in and check it out:
http://www.youtube.com/watch?v=pEYSb66ndNY&NR=1The MAIN difference can be traced back to what is done when the backswing starts/when the hands break.
In baseball hitting and pitching, you break the hans by internally rotating the back arm, THEN lifting it, unlike golf where you just lift. This back arm internal rotation prevents the excessive turning back which would make the mlb swing too long.
Once you break the hands, how you use the back arm sets you on the path.
In mlb, this back arm action/loading prevents the hands from getting stuck and sets you up to minimize arm action and contol the swing by handle torquing and shoulder tilt. The one-piece action is again, avoiding the "stuck" feel which comes if you let the hands drift back too far or don't load them well to begin with.
The PCR hitting swing and 1Plane golf swing are VERY different ways of running the chain where there is no handle torque and no shoulder tilt and the active turning of the shoulders swings the arms back and forth in the shoulder plane rather than having shoulder action respond to the synched arm swing and body turn movements.
In golf 2 plane, you avoid handle torque and shoulder tilt because quickness is not an issue.
