MFR 129: Electrolytes Part 2

Not all electrolyte replacement products are the same, not even close. 
Jen has been running a while, but she hasn’t ever trained for marathons. Now, she’s often running for two hours, and she’s finding that she really starts to feel fatigued. She assumes it’s that she’s not eating correctly or that her training hasn’t been sufficient. She’s even wondering if, maybe, she shouldn’t have committed to the marathon, that maybe she just isn’t strong en