You can find out more about the Start Happy series on this site, which will be updated regularly with brilliant articles, blogs, videos, giveaways and much more. There will also be a series of new guides packed with expert advice about how to get fit, physically and mentally, and stay that way. Look out for the first one in tomorrow's Guardian followed by a British Military Fitness (BMF) workout download in the Observer plus one week's free BMF membership.
