The traditional Russian fitness equipment is shaped like a shell with a handle, which is similar to the ancient China fitness equipment "Stone Lock". The traditional kettle bell has only one weight, 16 kg (35 lbs), and later it began to add styles with different weights. The weight is one step every 4kg, and the common weights are 8, 12, 16, 20, 24, 28, 32kg, etc. Due to the popularity, there are also lighter ones, only 5 kg. The heaviest kettle bell has a single giant kettle bell of 92 kg (203 lb), which is classified by appearance. There are two types of kettle bells: typical and competitive. Typical kettle bell, the whole part with handle is made of solid cast iron. The overall volume is small, and the space required for placement is less. According to the increase or decrease of weight, the overall volume and handle diameter will change in a certain proportion. The heavier the typical kettle bell, the larger the diameter of the handle. For people with small palms, it will be difficult to hold the handle firmly when using a typical kettle bell weighing more than 24 kg. In contrast, a typical kettle bell is helpful for grip strength training. The kettle bell is a full-body exercise, which is different from the first impression that most people see the kettle bell for the first time or when they see someone practicing. The kettle bell is a very safe whole-body exercise. As long as you learn the correct concept and operation method, it is an extremely time-saving, safe and effective choice of fitness methods. The action of kettle bell needs correct and safe posture and action, which can last for three to five minutes or longer, and can't blindly pursue weight. The use of kettlebells does not depend on the brute force of the upper body, and some movements even prohibit the brute force of the limbs. This sport needs the strength of the trunk core and lower body, which is strong, powerful and durable.