I have an iPhone and a couple iPods around my house. I used to like to listen to music on my iPhone while I worked out until I nearly ripped my ears off when I caught the cable on one of the machines. Then there was the time I got the cable caught on the treadmill arm and the iPhone went shooting off the back of the belt after the arm pulled the thing out of my pocket. I stopped wearing earphones while I worked out after that.
A new accessory is now available for the iPod, iPhone or any other device that uses headphones called the iLocket. The little plastic thingy has a hinged lid that covers a cord wrap you wind the extra cord around to get just the length you want.
On the back of the iLocket is a clip that you can clip to your clothing to keep the cable from flopping around while you exercise. The thing is pretty cool and I might actually try to exercise with my iPhone again if I had one. You can grab one on Amazon for under $5 (USD).