Handbook of lessons in physical training and games for the Philadelphia public schools (1910)
Stecher, William A. (William Albin) · [Philadelphia?] · leaf 17
8. Bend the Knees.The trunk and head mustbe held upright. Theheels are locked and areraised from the floor;the knees are turned out-ward. Common faults are astooping forward, a for-ward lowering of thehead, and a failure toraise the heels and tokeep the heels locked.
Physical education and training · Games
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