It is widely believed that stretching improves running performance and lowers the risk of injuries. But, a group of researchers say that belief is a myth. Instead, they say an active warm-up can help with running performance and progressive training can reduce injury risk. The researchers are the creators of an infographic series for the British Journal of Sports Medicine. The series is designed to separate truth and myths about running. The research team says there is evidence that stretching could help keep joints moving well. But they say it does not help, or harm, performance.