Maybe you're not like me, and you find that your joints only crack during a workout. That's also normal, because that's often when your body is moving the most during your day. Occasionally though, you might be hearing a different kind of cracking during a workout, Dr. Tehrany says. "Sometimes when a joint moves, the tendon that surrounds it may move out of place," he says. When that tendon shifts back into its place, then you might hear a snapping or cracking sound, he says. Although that might seem a little scary or intense, it's not really something to worry about. Changing the type of movement that causes a crack or stretching is usually enough to make it go away.