Which is better: Working out to the same songs on repeat – or switching it up and exercising to random music? Go ahead and hit repeat. Working out to music is good no matter what – it helps us exercise longer and harder without feeling the additional effort. But when we listen to songs we know we like, we get an extra mood boost. That’s according to the book “Inside Sport Psychology.” But when we listen to unfamiliar songs, our brain gets distracted trying to figure out the music and lyrics – and, as a result, our exercise efficiency is reduced. So put your workout playlist on repeat – and discover new music another time.