With the development of science and technology, modern equipment is widely used in production and life instead of manpower, which makes people get rid of heavy labor. Due to the limitation of conditions, there are still quite a few production links where manual labor accounts for more than half of 1/3, such as construction, warehousing, transportation and loading and unloading, mining, cement, glass and ceramic production.

During heavy physical labor, due to incorrect posture or improper exertion, it can often cause acute soft tissue injury in waist and other parts, or chronic strain of muscles and ligaments caused by maintaining an unbalanced posture for a long time. Strengthen physical exercise, especially muscle strength training, so that muscles, ligaments and joint capsules are always in a healthy and developed state. People with good muscle strength and ligament elasticity will have less chance of strain. At the same time, pay attention to body posture when working, and avoid working in bad posture for too long. For those who work in a single position, we should insist on exercising during the rest time to relax our tired limbs.

(3) Recommended exercise: bend your knees and abdomen. sit-up

(4) Practice method: bend your knees, tuck in your abdomen, stretch your arms, and bend your knees as close as possible to your chest. Repeat 10 ~ 20 times. Lie on your back, sit up gradually, reach the sitting position first, bend your torso forward, and try to touch your toes with your hands.