Extreme kit testing: which gear is best for 24 hours of non-stop running?

Running round and round in circles for a full day and night? The things Adharanand Finn will do in the service of the running blog ...

Many years ago, I worked as a writer for Which? magazine, and often had to visit its testing laboratory in Milton Keynes. Without giving away any secrets, they test things vigorously at Which?. There were rooms for overheating microwave ovens until they exploded. There were sound labs peopled with experts sitting with their eyes closed. They had a bumpy treadmi...