No matter how old you are, how fit you are, or how busy you are, walking works. Make a promise to get started, and to stay committed. The goal is to walk actively just five times a week for 30 minutes each time. You can start with just 10 minutes of walking and build from there. Even if you walk out your front door for five minutes and walk back, you're going to feel good - and you're starting to do yourself some good.