What's one thing that SoulCycle, Orangetheory, CrossFit and Zumba all have in common? Each one of these group fitness classes bumps intense music through loudspeakers. Even as you battle muscle burn, ...

Music boosts motivation and increases happiness when people are working out better than any other predictable factor. But what musical tempo is best for keeping people psyched up while working out?

Perfect Tempo lets you speed up or slow down any song in Apple Music, so you can learn how to play it. Unlike every other app that does this, Perfect Tempo works on any song on the Apple Music service ...