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How do the parts of a lever apply to principles of exercise in the body?

  1. Joints are the axis, skeletal muscles provide resistance, and any weights carried cause force to be applied
  2. Joints are the fulcrum, weights provide resistance, and the movements issue force against the weights
  3. Joints are the fulcrum, weights provide resistance, and the skeletal muscles are the axis
  4. Joints are the axis, skeletal muscle contractions cause force to be applied, and the moving portion are the resistance
Explanation

Answer: D - In exercise principles in the body, the parts of a lever operate as follows: joints are the axis, skeletal muscle contractions cause force to be applied, and the moving portion (limb and any weights carried) are the resistance. Any time the location of the resistance changes in reference to the axis, the exercise can be progressed or regressed.

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