I'm constantly having a debate with people about benching technique, some say stop 2 to 3 inches short from touching your chest, where I say go for the stretch and touch your chest. Now I do realize bringing your arms and shoulders that far back with big weight on the bar IS performing an unnatural movement, still I believe your just not incorporating all the muscle fibers without it.
Same as standing rope extensions for triceps, some guys stop right when their forearm is parallel to the floor, I however, bring my hands all the way up to almost my shoulders, then bring them down for a full extension. Although bringing them parallel keeps constant tension on the muscle, I just don't feel I'm incorporating all the fibers.
What do you guys think?