Useful. Yan video fitness, simple movements, from warm-up to abdominal muscle training, squats, chest muscles, Bobby jumping for a few minutes of video, immediately increase the heart rate, effectively reduce fat, simple movements, good results. It depends on the individual's physical condition, fitness goals and personal preferences. When choosing a fitness video, it is very important to find a video that suits you. You can understand it by watching the introduction, evaluation and content of the video.