The core idea of fitness is to improve physical fitness through exercise, including muscle strength, cardiopulmonary function, flexibility and coordination. Core training is an important part of fitness, which can help people strengthen the strength of core muscle groups, thus improving the stability and balance of the body. Core muscles include abdominal muscles, back muscles, gluteal muscles, gluteal muscles and so on. The training of these muscle groups can help people improve their posture, reduce the risk of injury and improve the exercise efficiency of the body.