I run once or twice a week usually, each 6, maybe 10 miles. A few times if I've felt up to it I've added extra segments on, running half marathon distances a few times, 14 miles a couple of weeks ago, with, admittedly, sore legs, but able to carry on with my day, perhaps just hobbling on stairs for a couple of days!
A week after the 14 miler, I'd signed up fir a 15 mile event. On the day I just didn't feel particularly energetic Even jogging to the toilet block before the run! I had minor heartburn. Perhaps because I'd just wolfed down a banana. Anyway, the run didn't go as well as my usual runs, chest pain didn't get any worse, but my energy levels were seriously down, despite taking energy gels at about 4 intervals. I actually ended up stop-start walking for the last couple of miles. Really disappointed in myself.
For the rest of the day I was wiped out, flat on my back. I put it down to burning 2,000 calories or whatever it was (My Garmin and Strava told me different things!) and my body just having no more energy left.
But I can't see how I could fuel myself any differently. And what was so different to the previous week? I'd eaten the same. Quite a carb-loaded dinner the night before, simple breakfast, perhaps peanut butter on toast on the morning of the run, nothing but a banana in the couple of hours before start.
I want to train for a marathon in 2019, and really want to get this nailed before then. How is it possible to load up enough energy for a marathon?
Perhaps I was just generally under the weather, with aches and pains unrelated to running, which the running didn't help with (and didn't help with the running)?