If you feel these symptoms, it’s already too late: Cramps, chills, dizziness, sudden increased perceived effort, a spike in heart rate while on the course, the clock is ticking and you could either DNF or forget about your PR. Here’s the thing: If I’m losing 1600mg/hr, taking 1-2 x 500mg sodium electrolytes just isn’t enough and I’m not even accounting for heat, humidity, you name it. So what I'm saying here is that understanding your numbers is a game-changer. I’m a heavy sweater. Everyone’s different. This is your reminder to dial in your hydration, like you do your training. Stay Working. #athlete #runner #running #performancelab #marathontraining #hybrid #dreamon EVER CRAMPED DURING A RACE?