The best exercise method for lumbar muscle strain is to perform functional exercises on the bed, such as the "Little Swallow" exercise. Lie prone on the bed, lifting limbs and head off the bed, supporting your body with only the abdomen, hold for two seconds each time, and perform this exercise more than 20 times a day. The second method is the "Five-Point Support," where you lie on your back on the bed, use your head and limbs to prop up your body, and then leave your waist suspended in the air, holding each position for two seconds, also repeating this 20 times daily.