Summary

Caroline Walker,  The Modern Dances — Chapter II. General Instructions (1914)

“ Do not hold the body or arms tense. All movements should be free, easy and natural.
Do not sway the body or hunch up the shoulders.
Dance with a "soft" knee. By this I do not mean that one should have the appearance of jumping up and down. On the contrary, the shoulders should travel on a line as though there were pieces of glass on them, which must not be allowed to drop off. But do not keep the knees stiff. These dances are done with the limbs, not with the body, the weight being always on the ball of the foot.
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Source: Wikisource

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