What exactly is energy? We envy people who have bags of it--as few and far between as they are--and spend our lives moaning that we don"t have enough of it. We all know that a healthy diet and a simple exercise regime could make all the difference but, oh, we are just TOO tired to make the effort. And anyhow, how exactly do you rediscover your zest for a life that is mostly spent commuting between computer terminal and sofa?Judith Wills may just have the answer. Her perky little book 4 Weeks to Total Energy sails breezily through the definitions of energy (she believes that "energy is the personal life force which enables you to maximise your potential in every area") before pointing you in the right direction, promising that in only four weeks you will look better, feel better, sleep better and generally have a better quality of life.The "Energy Quota Questionnaire" is a little scary but worth taking time over and once you cross that short bridge and make an honest assessment of your lifestyle there should be no stopping you. After that, the different sections, ranging from "Getting Back to Basics" to "Controlling the Chaos", should present few problems if you determine to follow Wills" easy-to-digest advice.So whether you need hints on which form of exercise will suit you best, which vitamin supplements could make all the difference, how to get more sleep or simply how to take better control of your situation, then this bright, cheerful and, most importantly, accessible book could be just the thing to get you off that sofa and into the fresh air. --Susan Harrison