1, rhythm dumbbell dumbbell can not only make the arm thinner, but also have obvious effect on the sculpture of back muscles and shoulder lines, and even can be used as gravity assistance when you exercise the lower body, making the lower body exercise more effective. 2, elastic rope human muscles are large and small, big muscles can be trained with heavy dumbbells, small muscle groups (such as back arms) are difficult to train, you can use elastic rope. In addition, after weight training such as dumbbells, you can also stretch with elastic rope. 3, the first contact of the abdominal wheel will definitely feel quite laborious, because it will be full of sweat after several times, but after the completion, the abdomen will have obvious feelings, so when there is fat in the abdomen, it is necessary to overcome inertia, increase the number of times step by step, and persevere. The advantage is that you can exercise the muscles of your arms and abdomen at the same time. 4, grip this is a very common fitness equipment, the most important role is to train the grip of the palm and strengthen the muscle curve of the elbow, so it is more suitable for boys. If you need to tighten the elbow muscles, the grip is a good choice, but it has no obvious effect on the thin arms.