There's a gym at my work where I go from time to time to use the cross trainer but its incredibly boring and I like to read and listen to music to distract myself.
Books are difficult because the type is usually quite small. Magazines are expensive, I don't actually find many of them very note resting, and some of the article like "How to Have a Screaming 5 Minute Orgasm" have really large embarrassing headlines that I would be embarrassed to be seen reading by my colleagues who also use the gym!
I have an old iPad and can download Kindle books, articles, etc onto it. I'm thinking about starting to use it at the gym as a book/magazine substitute to read what I like on in the ideal font size 
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If you saw someone at the gym with an iPad would you think they were crazy, a show off or some other type of idiot? Normally I wouldn't care that much but my boss, her boss and a lot of company bigwigs use the gym. And if you've ever used an iPad at the gym any advice on apps, etc would be great. It won't be connected to the Internet at the gym so any content would need to be downloaded beforehand. This I think makes apps like Flipboard unsuitable but would be happy to be told I'm wrong about that.