Walking is probably the most under-rated exercise, because it doesn't require much exertion, and people do it every day. But how much do you actually do it? Do you walk instead of take the bus whenever possible? Do you think 8-10 blocks is "too far" to walk? There are serious health benefits from walking: it tones your entire body, you can do deep breathing exercises at the same time, and the body naturally aligns itself when you walk with a straight back and an extended chest.