What is wrong with defining physical activity as "voluntary movement, intentionally performed for specific purposes, that requires a substantial amount of energy"?

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in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

thinking it would be fimbriae