It's mental. I have a friend who is able to press more weight on the Bench Press only while I'm spotting him. What he asks me to do is simply grab the bar and keep my hands on it throughout the entire set. I don't help him lift the weight, my hands are only on the bar while my friend performs his set. For him, it gives him more confidence seeing me there with my hands on the bar.
I don't think your coach is pinching a magical spot in your wrists that all of sudden enables you to press more weight. You probably just felt more sure of yourself while he was there. It's all in your head.
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Practice makes permanent.
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