Listening to music while exercising really does boost your endurance, researchers have shown.
Doctors found people who listened to upbeat music through headphones could run for nearly a minute longer during a tough stress test on a treadmill.
The researchers, from Texas Tech University, believe doctors should encourage their patients to listen to music as a way of helping them exercise.
They said music acts as a powerful motivator - improving mood and triggering feel-good and energy-boosting chemicals in the brain.
Doctors found people who listened to upbeat music through headphones could run for nearly a minute longer during a tough stress test on a treadmill
The scientists, who are due to present their findings at a major heart conference in Florida later this month, said music could help people stick to exercise routines.
Study leader Dr Waseem Shami said: 'At least on a small scale, this study provides some evidence that music may help serve as an extra tool to help motivate someone to exercise more, which is critical to heart health.
'I think it's something we intuitively knew, but we found to be true. I suspect if it had been a larger study, we'd see a bigger difference.'
Smiling while running could boost efficiency and help you save energy over long distances, according to a new study.
Researchers discovered being happy helped runners consume 2.2 per cent less oxygen than those who showed no emotion.
Smiling provided an even bigger boost compared to frowning, the scientists from Ulster and Swansea universities found.
Oxygen is often used to measure how much energy runners use, with higher amounts signalling they have used