Running is generally a simple activity but even on short runs you may have to carry a house or car key, perhaps water and perhaps a phone. The more time you spend running and the further you run the more you need to carry in the way of fuel and water. Although some running shorts or trousers contain a useful pocket, often a running belt with additional pockets is essential to carry all of those extra gels and additional water/ sports drink if required. It needs to fit comfortably, be easy to wash and not cause chafing!
