Tough Girl Podcast

Harriet Frost is a force of energy, endurance, and entrepreneurial grit.  From completing the notorious Arc of Attrition 100-mile ultra twice, to directing multiple trail races, to co-founding a menstrual cup company focused on sustainable period care for athletes — Harriet is redefining what it means to pursue hard things, in business and on the trail. In this episode, Harriet shares her journey from growing up in Cornwall to discovering a love of endurance sport later in life — despite hating running at first. With no formal coaching, she’s built her own training strategy based on experience, discipline, and gut instinct — and it’s taken her to the finish lines of some of the UK’s most brutal ultra events. We also dive into the founding of Sea+Flo, a period care company created by women, for women, aiming to empower people to better understand and manage their menstrual health during sport. Harriet speaks candidly about the mental strength required to train alone, run in the dark, and manage periods while r