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  Pilates doing Pilates Exercises:   The Jack Knife Joseph Pilates 34 contrology poses
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Important
(1) Serious students: buy & study "Return to Life..."!
(2) Avoid potential injury! - Join the "Pilates Community" at your local gym or studio.
(3) Tips on posture and muscle tensioning - "Pilates Contrology".

Editor's Comment: Text to follow.
Pilates demonstrating The Jack Knife, Poses One to Four:
(diagram derived from original photo).

Joseph Pilates doing the Pilates The Jack Knife
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Reference
  1. J H Pilates and W J Miller: Return to Life through Controlology. 1st Ed, publ. 1954 J.J.Augustin New York (Review & purchase...)
Pilates The Jack Knife , © Bruce Thomson, EasyVigour Project