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The exercise is presented as a valuable one to increase the extensibility of the back and the power of the abdominal muscles. It is especially recommended in that large group of patients with contracted muscles and ligaments in the lumbar, lumbosacral and sacro-iliac regions. It is not an easy or a beginning exercise.
The apparatus consists of a 1½ inch belt strap 15 inches long, fastened to the floor, and a small stool, 14 inches high, 11 inches wide and 18 inches long. The subject sits on the stool and the forefeet are slipped through the strap. The hands are placed behind the head. On the count of one, the trunk is allowed to hyperextend until the head touches the floor. It remains in this position during the counts of two and three, and on the count of four the return to the starting position is made. This
Lewin P. SPECIAL EXERCISE FOR INCREASING EXTENSIBILITY OF THE BACK. JAMA. 1927;88(17):1319. doi:10.1001/jama.1927.92680430021009
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