Chemical energy is used for breaking the bonds of atp molecules to energize your muscle cells.
When work is done and heat and light are produced, energy is the quantitative quality that is transferred to the body or to the physical system. The law of conservation of energy asserts that although energy can be changed in form, it cannot be created or destroyed. Energy is a conserved quantity. The definition of a joule, the SI unit used to measure energy, is "the energy imparted to an object by the work of moving it a distance of one metre against a force of one newton."
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