It can't be useful for everyone, but only for 10% people. If you want to lose weight and fat, you still have to follow scientific principles. Increase 1 exercise more and eat less food. After all, in nature, energy is conserved. All the energy you consume is either discharged through exercise or you consume less. Do not expect such a machine to break the law of conservation of energy. And fitness is a healthier way to lose weight, and other ways may have side effects or rebound.