The difference between Natalie Howcroft and Nicola Henderson, and most other women, is that the friends have recently become world-level athletes in one of the most punishing sports imaginable. And in June they will compete as a two-woman team in a World Championship in the endurance fitness race, Hyrox. They face the most intense challenge of their lives against the planet's best in their age group. It will take them to new levels of exhaustion. So who are Natalie and Nicola - and why do they... Read this story
