Dumbbell Dumbbell is a kind of fitness equipment which originated from ancient Greece. It is one of the most commonly used, convenient and effective fitness equipment, and has the reputation of "hammer chisel for carving muscles". As long as there is a pair of dumbbells and a bench, the trainer can exercise almost every muscle of the whole body at will. Dumbbells can be divided into fixed-weight dumbbells and adjustable-weight dumbbells. The former is usually cast with pig iron, with a fixed weight ranging from 2- 10KG. The latter is similar to a reduced barbell, mostly made of hard plastic or pig iron. The two ends of the short iron bar are sheathed with round iron pieces with different weights, and the length is about 40-45cm. The weight of movable dumbbells can be adjusted by increasing or decreasing the number of dumbbells as needed. There is also a pocket dumbbell, the surface of which is electroplated and polished, which is very light, small and exquisite, and is often used in women's gymnastics training. Dumbbells can be used in a variety of ways, and can be practiced with one hand or both hands at the same time. There are dumbbells around the ankles to practice, and practitioners can choose different practice methods according to different needs and their own specific conditions. Long-term practice of dumbbells can modify muscle lines and increase muscle endurance. Regular practice of weight-bearing dumbbells can make muscles strong, strengthen muscle fibers and increase muscle strength. Second, the shape of the kettle bell is similar to the stone lock commonly used by the people, and it is cast from pig iron. The weight varies from 1-25 kg, and people can choose different weights according to different needs when practicing. The big kettle bell, the kettle body and the kettle handle are cast at the same time, which is seamless; A small bell, the bell handle is welded on the pot body. When using the kettle bell to keep fit, you can hold the handle with one hand or both hands to complete actions such as bending your arms, bending over and jumping sideways, so that the muscles of your arms, back and legs can be exercised.