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Strength training follows the fundamental principle that involves repeatedly overloading a muscle group. This is typically done by contracting the muscles against heavy resistance and then returning to the starting position.
The specific strength is a material's (or muscle's) strength (force per unit area at failure) divided by its density.It is also known as the strength-to-weight ratio or strength/weight ratio or strength-to-mass ratio.
The field of strength of materials (also called mechanics of materials) typically refers to various methods of calculating the stresses and strains in structural members, such as beams, columns, and shafts.