First of all, the bar in the machine is probably not 45 lb. Secondly, when you use a machine, you are not using muscles to control the motion of the bar in any direction other than vertical.
You have proved once again why machines are inferior to free weights.
All is not lost, however. Just start using free weights, but at a lower weight than what you are used to. In time, you'll be back to where you are now with the machine.



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