I have achieved success in the Reebok Run Light Challenge. It was straightforward: run your fastest mile. I signed up after running a run, and was awarded the badge immediately. I must have run fast without realising it, because my run, 5k avoiding the hill, did not seem particularly fast at all.
![by Neil Tilbrook [cropped]](https://i0.wp.com/pandammonium.org/wp-content/uploads/2016/04/raceforlife-e1626187757608.jpg?resize=150%2C150&ssl=1 "Running hiatus and solution: race sign-up")