Time to toss those crusty old cross trainers: The latest high-tech, lightweight running shoes are more capable than ever before. How do we know? We handed fifteen testers 20 pairs of the latest models. After logging more than 300 combined miles with each pair, they whittled down the selection to these seven sneakers. Some are best for training, while others are built for marathons; all provide a mix of stability, cushion, and road feel that will help you go farther (and faster) this season.