Training for a marathon requires you to do a lot of work. You will need to make sure your body is in the best shape possible. If you're not in good shape, then you won't stand a chance to complete all of those miles. While part of that training involves exercise (running, conditioning, even some weight lifting on some occasions), another aspect involves diet. If your diet is not on point, then you risk sabotaging yourself and not successfully completing the race.
Fermented foods are all the rage these days, from kombucha to kefir to kimchi. Not only do these foods have a unique mouthfeel, they can provide probiotics that keep your digestive system, and even your entire immune system, in balance. But if you don't have a taste for fermented food, don't have the time to make your own, or want to expand your fermented diet, fermented enzyme supplements may be the answer.