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PostPosted: Fri Jan 14, 2011 12:56 pm 
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http://www.exrx.net/WeightExercises/Pec ... DBFly.html

This says to keep the shoulders internally rotated. This keeps tension on the elbow flexors to stabilize that joint for example.

My question is: if the idea is to isolate the pecs (for example, if people have overtrained anterior deltoid) then wouldn't external rotation be good?

This is the position taken when people do flies on a pec deck. The internal rotation takes the anterior delts out of commission.

The main reason that comes to mind is the elbow stress, but can't the body get used to that?

The force is oriented so that gravity wishes to laterally dislocate the elbow. So the stress would be on the inner/medial part of the ulna if I understand it right.

We do moves which are the reverse of this though, for example, transverse abduction of the shoulder
http://www.exrx.net/WeightExercises/Del ... Raise.html
http://www.exrx.net/WeightExercises/Del ... Raise.html
http://www.exrx.net/WeightExercises/Del ... Raise.html
Image
http://www.exrx.net/WeightExercises/Del ... Raise.html

Transverse abduction, the opposite of transverse abduction which is done in a peck deck and the kind of dumbbell fly I am proposing, involves gravity attempting to dislocate the elbow medially, putting stress on the outside (lateral aspect) of the elbow joint.

If we can handle that, surely we can handle a complimenting dislocative force in the opposite direction with these flies.

Just as one might use a pec deck in reverse to save the outer elbow, one uses a pec deck to save the inner elbow, yet we could still do flies to better isolate the pec (or get a nice middle/rear delt work with the tabduction) and perhaps gives stimulus for strengthened elbow ligaments to prevent the deforming forces.


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