There is nothing quite like music to motivate you on your workouts, people who manage to push themselves during a session with nothing but the sound of their own wheezing breath and pounding heartbeat in the ears are some sort of weirdos. The issue is that you may have some really good over-ear headphones already, but wires and bulky headgear are just not your friend in the gym, seriously try doing 10 burpees without them doing your head in.