Quote:
Originally Posted by RobertSDSU
When I deadlift at max weight, my left pectoral muscle cramps up and locks up.
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The reason your left pec cramps up is it is being stretched to much during the deadlift. Try reducing the weight for a bit and go for more reps.
Also, lock your shoulders in the "set" position. To do this you need to pull your shoulders up, back, and down. This will prevent one side of your body being stretched more then the other.