An exercise repetition sensor comprises an electricity generator, such as
an electricity generator, which is coupled to an exercise system, where
the electricity generator is capable of sensing exercise movements of any
size or intensity on the exercise system. The electricity generator can
be based on a number of electrical, magnetic, or optical sensing
principles. For example, an electricity generator comprising an
electricity generator includes a spindle that is coupled to one or more
parts that move in proportion to an applied force. The voltage-generator
generates an electrical current as the spindle moves, and sends the
electrical current to an electronic display interface. In one embodiment,
the voltage-generator sends a positive direct current through one of two
circuit wires to the electronic console, such that the electronic console
can immediately identify that the user has performed an exercise
repetition.