Left Chest Muscle

I have been working on the movements with proper rotation on my backswing (without a club).  I have my arms 2" apart until I get my shoulders fully turned and then I do right elbow flexion and some shoulder elevation.  Once I am fully turned I feel some engagement or I guess flexing on my left pec when I hold this position.  If I drop my left arm down it goes away, but when I bring my left hand back in connection with my right hand I feel this right away.  Is this normal or am I doing something wrong?  I am really focusing on keeping my lats engaged and arms passive.

Originally posted by rufdiggity I have been working on the movements with proper rotation on my backswing (without a club).  I have my arms 2" apart until I get my shoulders fully turned and then I do right elbow flexion and some shoulder elevation.  Once I am fully turned I feel some engagement or I guess flexing on my left pec when I hold this position.  If I drop my left arm down it goes away, but when I bring my left hand back in connection with my right hand I feel this right away.  Is this normal or am I doing something wrong?  I am really focusing on keeping my lats engaged and arms passive.

Originally posted by rufdiggity Thanks Mike and check!  That definitely makes sense why I feel those muscles.  One other issue I am having (yes i got a lot!) is when I am doing this movements and really concentrating on the muscles that should do the pulling I am feeling some tension or even soreness in my lower left side of my back at impact and the follow through.  This is really only when I am doing them really slow.  I am checking my setup to make sure my weight is over my ankles and then when I get to the downswing I am really making sure my left heel is pushing in so that I get that glute to engage.  At the same time I feel my glute engage, but I also feel some tension in my lower left side of my back.  Am I doing something biomechanically wrong?

ruf,
Hard to say for sure and this may be better for Chuck to answer...but if the soreness is more toward the outside edge of the lower back and NOT right next to the spine then it could be the left lat muscle.  That is where the lat muscle originates and runs all the way up to your armpit.  This is our primary pulling muscle for the downswing in RST (along with the rear deltoid and oblique muscles).  So if you are isometrically contracting those muscles in an effort focus on them more, especially while slightly leaning forward as you have to do in the golf swing, then this may be the source of your soreness.  I would be careful though that you are hinging from the hips and not bending from the waist.  That would be bad for the lower back in general but you may feel it as pain emanating from the spinal erector muscles on either side of the spine.

@check: Lat muscle can not be the primery pulling muscle in downswing. In RST's backswing and downswing, the most important muscle is oblique muscle.