Going the distance

Pippa Murray is a London-based marathoner who made delicious nut butter to fuel her runs. She tells us why she quit her day job to turn her passion into booming business Pip & Nut – and why it involved living in a shed for three months. Meanwhile in Tunisia, two friends have invented a radical clean-energy device that’s named after an ancient Carthaginian god and looks like a dancing rice bowl. Our correspondent in Tunis puts on her windbreaker to tell the story of Saphon Energy. Plus: sweatpants and sneakers worn far from the track and field: we break down the fashion of fitness and the branding of ‘athleisure’ with Raphael Güller from Winkreative.