Precautions Tighten your abdomen, arch your back slightly, and put your hands at chest height. During exercise, try to touch the opposite palm with your knee. Hold on for 30 seconds and do it as many times as possible.

Action 2:

Note: Don't buckle your knees during exercise. Knees should follow the direction of toes. From the front, your legs are straight. Watch your toes, not your whole foot. Hold on for 30 seconds and do it as many times as possible.

Action 3:

Note: this action is a compound action, which is difficult and may lead to hypoxia. Therefore, we should do what we can. Hold on for 30 seconds and try to finish 12- 15 times.

Lipid is the general name of oil, fat and fat. Oily substances in food are mainly oil. Generally, liquid at room temperature is called oil, and solid at room temperature is called fat. Fat is composed of three elements: C, H and O. Fat is a triglyceride composed of glycerol and fatty acids, in which the molecule of glycerol is relatively simple, but the types and lengths of fatty acids are different. Fatty acids are divided into three categories: saturated fatty acids, monounsaturated fatty acids and polyunsaturated fatty acids. Fat is soluble in most organic solvents, but insoluble in water.