Pre-exhaustive sets

I recently found a very interesting article that mentions the use of pre-exhaustive sets which bodybuilders generally use to get "buff"(excuse the expression), it basically uses the main muscle for longer taking it to full exhaustion.

Eg. Before doing bench press working the chest, you should do a number of pre-exhaustive exercises such as wide arm dumbell flies which involves the surrounding muscles such as the arms etc. to assist in the development, then you should go onto the bench press which will isolate that the pectoral muscle and give it a longer workout allowing it to develop fully.

have a look at the following for more information on it: http://www.abcbodybuilding.com/magazine/
pre_exhaustion_method_reviewed.htm