The person is not creating energy, and therefore the energy to make the flywheel spin comes from potential (stored) energy in the muscles of the individual.
The energy cannot be created or destroyed and it becomes from other sources that convert to produce a given type of energy, it is part of the law of conservation of energy.
For example, the chemical energy of foods is converted into mechanical energy when making physical exercise.
In conclusion, the person is not creating energy, and therefore the energy to make the flywheel spin comes from potential (stored) energy in the muscles of the individual.
Learn more about the law of conservation of energy here:
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