So yesterday I ran the LBI 18 Miler as a training run. I did a good job hydrating in the days before, but I'm thinking maybe I over-hydrated and messed up my salt. I take 2 clif blocks every three miles or so but at mile 14 my calves totally seized up. I tried to stop and stretch but that didn't help. When I finally got to the finish line (4th from last in 4hrs 12 mins) I had two bags of pretzels and it was like I had new legs. So I'm assuming this is a salt issue, right? Should I be running with salt packets now?
I'd hesitate to go with just salt packets, something more balanced like Endurolytes might be more beneficial in the long run. Sodium itself can often cause more problems than it solves. Good luck!