I reckon 8km is my minimum. Up until that point I am maybe running too fast, everything hurts, my lungs are bursting, my heart feels overworked and I’m feeling every bump.
Then I go, ah – marvellous. The next 10km I love. I’m relaxed, the legs feel unstoppable, I’m floating over rough ground and I feel like I’m smiling.
Then, inevitably I struggle. Everything gets tight. But I can keep going. It just hurts. But I like it.