LG TonePro Bluetooth Headphones
Those looking for even better sound than the built-in speaker or included headphones will want to consider LG's TonePro bluetooth headphones. They're small, portable, have great sound, and wrap around the back of your kneck to stay out of the way. Then of course this is via bluetooth so there are no wires getting in the way.
LG offers these on Black, Grey, or White, and they promise 10-15 hours of usage on a single charge. Enough for a week of sessions and the gym.