An ankle sprain can be more serious than you think. See a doctor or physiotherapist to check for ligament damage, and in the immediate aftermath keep it elevated and iced.
Sally says, “Don’t run until you have strengthened it, otherwise you'll be in a continuous cycle of injury. Do plenty of balance work – brush your teeth and boil the kettle while stood on your bad leg, lifting onto the toes. Continue to cross train if pain allows, with swimming, cycling, and a cross-trainer. Then gradually build up to rougher terrain – start on good, soft but predictable trails, working back up to more technical terrain, hiking before running it if needs be."