Runners - what do you eat *during* long training runs? This is my first day of Whole 30 and my half-marathon training mileage is starting to climb. Feeling intimidated - first long run is in 2 days.   What are good substitutes for gu, shot blocks, etc?   Easier to carry is better. I don't have a whole lot of room in my race belt to go lugging a sweet potato around with me.   Thanks!