1. Ankle pump exercise: under the condition of straightening both lower limbs while lying in bed, naturally relax both ankles first, and then do back extension, which must be maintained for two seconds to the maximum extent. Then start to do plantar flexion from the maximum back extension state, and the plantar flexion should also be maintained for two seconds to the maximum extent, circle the circle, and repeat this process. In the process of lying in bed watching TV, reading a book or reading a newspaper, and talking with family members, you can continue to perform plantar flexion and back extension exercises. 2. Quadriceps strength exercise: quadriceps contraction, relaxation exercise: bed rest
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