Speaking from the point of view of a powerlifter, breathing helps a great deal, IMO. You want the pressure of the air in your diaphragm; when you reach the "explosive" or "bottom" portion of a lift, releasing the pressure will give you moderate assistance in pushing the weight. Learning breathing techniques has really helped my bench, squat, and dead.
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"The true meaning of life is to plant trees, under whose shade you do not expect to sit."
- Nelson Henderson
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Exhaling, inhaling 
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