I'm starting to have the opposite problem of you all though

I've been slacking off Yoga and Pilates this summer and have been having bladder control problems on the longer runs. Time to crack the whip on the core/pelvic strength.
I know hydration and electrolyte balance are part of that equation too, though, and I wish I knew how to get that sorted. It's something I've struggled with for decades - constantly seesawing between mild hyponatremia and dehydration, and in the meantime worrying about too much salt with my slightly high blood pressure and strong family history of heart disease, and also learning this summer that I have to supplement with fairly large amounts of magnesium.

Does anyone know if there's a way to figure that out? At this point I'd be willing to pay for testing if I even knew of an exercise physiology lab that could do it.