When I'm out running, I frequently see others doing the same, while hand-carrying their cell phones. (Once while running a 10k, I saw a man with three cellphones attached to his special belt -- really? Who could possibly be that important?) But I digress; if you need to be in constant communication or are concerned with your safety (pick a different route, perhaps?) and must have your smart phone, use a sports arm band holder. They're convenient to use, not that expensive, and your hands remain free of electronic gadgets. Here's a great example -- the iPhone Mesh Sports Arm Band ($15; was $20). This very durable sports accessory is backed with a breathable mesh to keep you cool while it rides on your upper arm, the heavy duty protection screen allows you to operate the navigation icons without removing it from the carrier, and the headphone jack and charging dock are fully accessible. This sports arm band is machine washable and a breeze to don and doff. Pair this accessory with your GPS-enabled training watch, and your New Balance running shoes and you're good to go. Literally.