When you're horribly out of shape (like I am) and are trying to get fit (like I am) you need something to spice up those long hours in the gym. This article suggests that an iPod might be the perfect gym companion, and virtual trainer. The article speaks to a few people who have downloaded 'personal trainers' to their iPods that give them encouragement as they work out.
Strangely the article does not mention the Nike + iPod Sport Kit, which is designed to do just what this article suggests. I'll be getting myself an iPod nano, and a sports kit, after the Sept 12th event (just to be sure, you never know) and I'll report on my experiences as a fat man with a sensor in his shoe.