iPods vary greatly in price and functionality. For running most people agree that the iPod shuffles are the best for their low price and durability. Most students prefer iPhones or iPod touches due to the amazing amount of functionality, they can play music, videos, surf the web, and send e-mail. Midrange between the two is the Ipod nano, the nano is small but cheaper than the iPod touch while still retaining the ability to play video. While its up to you to decide which is best for you, I personally greatly enjoy my iPhone and often wonder how i lived without it.