Dumbbell, a fitness equipment originated from ancient Greece, 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.

2, kettle bell, kettle bell shape is similar to the stone lock used by the people, made of 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.

3, barbell, barbell is one of the earliest fitness equipment used by human beings. Barbell training, similar to dumbbell training, is a kind of strength training, aiming at strengthening muscle strength. Barbells are widely used, regardless of the muscles of shoulders, back, arms, chest and other parts. With the help of barbells and iron pieces with different weights, special muscle strength training techniques can be used many times to burn fat and transform it into bodybuilding lines. In addition, it can delay muscle aging, increase bone density and prevent osteoporosis.

4. The stretcher is a kind of equipment suitable for mass fitness exercise, which can be divided into spring stretcher, belt stretcher and pulley counterweight stretcher according to different materials. Spring tensioners are mostly composed of 4 to 6 springs with handles at both ends. During the exercise, the number of springs can be adjusted as needed to adjust the strength. Belt tensioner is made of rubber, with two ends shaking hands and rubber strip in the middle. Tension is determined according to rubber strip's tightness. The pulley counterweight tensioner is mainly composed of crown block, counterweight and steel wire, and the weight of counterweight can be adjusted freely. The puller is cheap, small in size and convenient to use, and it is an ideal choice for family fitness equipment. It has a good effect on exercising the muscles of chest, shoulders, arms and back.