Training

What do you mean by "Train Your Gut?" I wish I had known about this before running my first ultramarathon in 2015. To prepare for the Olli Creek 100K, I read several books on training for trail races. I had all the necessary gear and trained on the OC trail at least ten times that spring and summer, even running it in the dark. The one thing I neglected was my nutrition plan. During training, I used a specific gel I liked and a couple of granola bars. On the supported runs sp