ok there are a few points to be aware of here:
1). the technique demonstration and elbow correction maybe good for Brad and his aims, limb length and position choice but not necessarily the best thing for everyone. Ultimately the end goal should always be stated before any technique advice is given - (ie chest building work with isolation of pec major, avoiding use of pec minor) as the technique would change depending upon that goal. Trying NOT to wreck your shoulders is an obvious point, not really the goal for the the exercise.
2). the point i think he is trying to make on the elbow correction specifically is that often people are too high at the elbow at the bottom part of the move and so the correction is to avoid this which, as he states, could potentially wreck your shoulder due to impingement issues.
3). The fixing of the upper back and shoulders is not necessarily functional so the goal needs to be confirmed for this to be made appropriate
4). The thoracic extension is also risky for some and I am not confident as to why that would be advised but if given a technical reason for this being advisable I would accept it. This puts massive loads through the spine that, if in excessive extension, are probably not the best when trying to avoid injury.
finally in response to your question :
form should NEVER be compromised if you wish to stay injury free
hope this helps
post edited by Rachfit - 2011/12/28 22:35:26