The strength should be high frequency and have a certain amplitude, but don't covet the strength and amplitude, which will easily damage the rod. After using it for a period of time, check whether it cracks due to physical fatigue and replace it in time to avoid splitting damage. Made of glass fiber and rubber, after high-frequency jitter training. It can mainly train the muscles of the upper body and bring them to the core muscles. Very useful for relaxing and tightening deep muscles! At first, refer to the standard movements, and then you can develop your own combination movements. Spring bar, also known as elastic bar, is a kind of fitness equipment that appeared in China in 1980s. The spring rod is 75 cm long and round. Because the middle part of the bar has a strong spring with a length of 25 cm, which can bend under the action of external force, it is a good fitness equipment for exercising upper limb muscle strength. Open your feet naturally, hold both ends of the stick with both hands, face each other, and raise your arms straight; Then, the elbow is slightly bent, and the arm bends the spring rod on the head hard; The bent part of the spring rod points to the back of the head. This sport mainly develops the strength of arm muscles. When practicing, each group can do 10 times or so, and do 4 ~ 6 groups. It will gradually increase to about 20 times in each group in the future. When bending the spring bar on your head with your hands, you should hold your head high and keep your upper body upright. You can't use your abdomen. When two wrist joints are forced to bounce inward, both elbow joints move inward at the same time. Hold the two ends of the spring rod in front of the abdomen with both hands, with fists and eyes facing each other and elbows slightly bent; Bend the spring rod with both arms; The middle bent part of the spring rod points forward. Do it continuously. This exercise has a good effect on developing deltoid muscle, brachioradialis muscle and upper limb muscle group. When practicing, each group can do 10 times or so, and do 4 ~ 6 groups. It will gradually increase to about 20 times in each group in the future. When bending the spring rod, the force should be applied from the wrist, forearm and upper arm in turn. When practicing, always keep your body upright.