Running can be long, hard and hot work.
But one runner has come up with a way of distracting herself from the task, creating masterpieces on GPS app Nike+ as she maps out her route.
San Francisco-based Claire Wyckoff has now created a blog of her work, which mostly features phalluses.
When asked by a fan how she plans the routes, Wyckoff responded on Twitter: "It's not easy. first, you have to spend a lot of time looking for dicks on maps... countless hours of dick searching..."
But her talents are not limited to genitalia. She has also created running drawings of a corgi, a space invader, a middle-finger salute and a pole dancer.