Gels have been described by Born as liquids in which an elastic resistance against shearing survives, yielding both viscous and elastic properties.
2.
In a static sense, the fundamental difference between a liquid and a solid is that the solid has elastic resistance against a shearing stress while a liquid does not.
3.
To do the exercises, you can use hand and ankle weights in graduated sizes, elastic resistance bands, resistance machines found in most gyms, cans of soup or even your own body.
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