Fitness doesn't have to be complicated. The essential principles are simple, practical, and intuitively understandable. Those who know them and integrate them into their lives will become fit and keep a clear mind. The author, personal trainer, and philosopher Christian Zippel consciously lives and trains "completely aimlessly." However, his body leaves no doubt that his method works. In his book, he teaches readers how to playfully integrate training, activity, and nutrition into their daily lives and get the best out of themselves with minimal effort. Readers will learn about their individual fitness accounts and discover how to keep them in the positive. They will learn which training principles have the greatest leverage on their personal fitness, how to burn more calories without exercising, and why the Pareto principle - 20 percent effort for 80 percent return - also applies in sports.