Description: Segment 1 A woman in a sequinned bikini walks towards and away from the camera with bare feet and in a low-heeled shoe. The intertitles note that the gaits are different. Examples of a poor and a good high kick are shown. A woman dances on one leg to show the action of the leg muscles. A woman twists around with her feet pointing forward to show the rotation of the spine. An x-ray of a straight spine is shown. Time start: 00:00:00:00 Time end: 00:05:13:11 Length: 00:05:13:11 Segment 2 An x-ray of a twisted spine is shown. A woman performs a back bend, and an x-ray of this position is also shown. Other types of back bend are shown. Time start: 00:05:13:11 Time end: 00:10:57:06 Length: 00:05:43:20 Segment 3 An x-ray of a normal spine is shown, followed by x-rays of different types of back bend. A woman twists herself into a crab-like acrobatic position, and an x-ray is shown. The intertitles describe the movements of the muscles during these unusual positions. Time start: 00:10:57:06 Time end: 00:16:25:10 Length: 00:05:28:04 Segment 4 An x-ray of another type of back bend is shown. A woman sits on the floor and holds the soles of her feet with her legs outstretched. The intertitles analyse the muscle movements required. A lady touches her toes, and an x-ray is shown. A woman performs different types of high kick these are shown in slow motion. X-rays of the high kick in various phases are shown. An x-ray of the pelvis area is shown. X-rays of a male vertebral column from different angles are shown together. A woman is shown walking with and without heels, and performing a 'remarkable back bend contortion'. Time start: 00:16:25:10 Time end: 00:21:37:19 Length: 00:05:12:09