We speak to the incredibly intelligent and wicked-fast runner, Britney Giles, about how to fuel before, during, and after a half or full marathon. She shares general best practices for becoming a more efficient runner through the fuel we take in. Find her on Instagram @dietitian_brit. For those looking for content on marathon training, running, lifestyle, beginner runner, new runner, first-time marathon, half marathon, 5k, 10k, and more. Follow us on Instagram @crummymarathoners and online at www.crummymarathoners.com