but with your workouts you could be really low on potassium/sodium levels. I have SVT (tachycardia) and if I don't keep my levels up my heart goes aflutter and starts beating all over the place. Yes, I still take a potassium supplement while cleansing. It's that or risk going to the ER -- but that's just my case. The next time you feel weird, check your pulse and rhythm -- you'll definitely be able to tell if it's skipping or racing.