You've all probably heard about this from Arnold* (said he imagined his biceps as mountains, good for control, blabla...), but does anybody actually do this in the gym? Has any coach around here mentioned this? What are the benefits?
I could see it being useful for cosmetic exercises like some type of high rep calf/bicep/tricep movement or maybe right before posing.
However, I can't see this being useful for any kind of compound exercise. A recent article from CW showed how even counting can lower output, let alone concentrating on being "swole."
Personally, I just focus on a tight core and accelerating the weight up. If I tried this while under a few hundred pounds I'd probably fold up like an accordion!
- The New Encyclopedia of Modern Bodybuilding, pg. 232-3.