Straight from the United States, crossfit is akin to a multidimensional physical conditioning program, because it is based on different athletic qualities. Mixing various physical exercises, this intensive training technique is based on natural movements to establish its effectiveness. But is crossfit really effective as part of a slimming diet? Well, lets see below. 1. What is crossfit? Cardiovascular endurance, muscular endurance, flexibility, power, strength, coordination, agility, balance, speed, precision ... Here are the ten athletic qualities that crossfit aims to develop or strengthen. How? 'Or' What? By means of varied movements which are inspired by several sports practices such as gymnastics or weightlifting . Developed by Greg Glassman, a former American gymnast, crossfit is defined as a particularly intensive cross-training which, beyond physical activity, is part of a true philosophy of life in which a balanced diet and hygiene of life occupy central places. 2.