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How is internal force relate to a pull-up exercise? how do you calculate internal in pull-up...

How is internal force relate to a pull-up exercise? how do you calculate internal in pull-up exercise with narrow and wide grip?

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Answer #1

In case of pull-up exercise with narrow grip, the tensile pull force is applied on our arm. Therefore, to oppose this tensile pull, the internal compressive force is applied internally by our arm. In the case of wide grip, eccentric tensile shear load is applied on our arm and our arm resists this force by applying internal compressive force.

The formula of the compressive stress produced is: External force/ Unit area

Here, external force will be the weight of the persons body and area is the cross-section area of hand.

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