Jen Done completed two full Ironman triathlons within 48 hours this summer. Her second race was four per cent slower than her first. In this conversation she's honest about what actually happened with her nutrition — what held, what fell apart, and what got her to that second finish line when almost nothing would go down.

Despite being a nutritionist, I don't often treat myself as a client. This year, for the Robin Hood 100, I did. 100 miles along the Chesterfield Canal and through Sherwood Forest. A sub-24-hour finish. Second lady. And somewhere around mile 90, a cheese biscuit with a fruit pastille stuck to it that I spat out with my crew's "you're an animal" ringing in my ears. Nutrition takes work. You never get it perfectly right. Here's what a year of building and testing a race nutrition plan looks like

Laura Watts has finished Badwater 135 — one of the world's toughest ultramarathons — five times. In the first Fuel the Story conversation, she breaks down what actually changed in her nutrition between her first attempt and her fastest yet.