If you like listening to music when you work out, why not get a pair of headphones that give you even more back in return? TheOn headset, by iRiver, connects to both Android and iOS devices, reporting back pulse rate, distance traveled, speed and maximal oxygen consumption. There are zero cords to worry about; the On connects to both Android and iOS devices via Bluetooth, so you'll be able to go about your workout restriction-free.

More: iRiver On Earbuds Capture Heart Rate, Performance As You Work Out