I'm pretty new to cycling, just started in April, right after my hubby bought a trainer, and right when the weather got nice enough to ride outside. But now I'm thinking I'd like to throw in a few more quick workouts on the weekdays riding the trainer. My question is, does it matter if you sit like you're really riding with your hands on the handle bars, or can you sit straight up "Look Ma, no hands!" style? Are there advantages or disadvantages to either? I'd kind of like to free up my hands for a book or magazine to stave off boredom, but I'm not sure if I will get the same benefit, or if I might be adding unnecessary strain to a body part, such as knees. (TV/video not an option). Thanks!