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					Originally Posted by grobar_14
					
				 so for pullovers is different???...you brethe in while exerting muscles and breathe out while relaxing..anyone else? | 
	
 you never breathe in or hold you're breath while contracting.  never.  while rare, the pressure increase can be enough to cause an anuerism.  back when i was in high school, an high school athlete in my state died that way in the weight room.  it doesn't happen often, i bet there's probably only 10-15 healthy people each year that it happens to, but it is possible.  
the book that told you to breathe in is wrong.