if I take a huge dose of a beta blocker and the only beta blocker you can do this with if you if you have low blood pressure as I do you have to be care but Propranolol is is fine CU it really it disproportionately lowers heart rate but not blood pressure but I've done this experiment a few times to test an idea which is would taking all of the gas out of my heart rate allow me to push harder and generate a higher Zone too and it turns out it does