1, engaged in work requiring repetitive lifting action; 2, wearing shoes without elastic padding walking or working on concrete; 3, work requires repeated twisting for a long time; 4, engaged in lifting heavy objects; 5, lifting heavy objects inappropriate posture; 6, prone position sleep; 7, using rowing machines; 8, driving for a long time; 9, limb unequal length; 10, recent weight gain; 11, excessive coughing; 12, high-risk occupations of lumbar muscle strain; 13, a variety of manual laborers; 14, cleaners; 15, warehouse work; 16, nursing work.