The iPhone allows you to store a massive amount of music, but it can be hard to take it with you when you're exercising. That's why you need to get an iPhone arm band. Using one of these, you can have your iPhone with you all the time. You'll only need to insert your headphone jack through the specially designed slot in your iPhone arm band, plug it in, and enjoy hours of uninterrupted music as you jog, lift weights, or ride a bicycle. Some of the best iPhone arm bands are waterproof, so you can use them in any weather. Get yours today!