NOVELTY - The power providing method involves measuring power supply current produced by user of exercise machine (100), measuring rotations per minute of exercise machine, determining power supply reference current, calculating differential power supply current based on power supply reference current and measured power supply current of exercise machine, calculating power supply duty cycle based on previous power supply duty cycle, and differential power supply current, and outputting power supply duty cycle to power output controller to control power supplied to console (120) of exercise machine.    USE - Power providing method for exercise machine (claimed). Uses include but are not limited to stationary bike, elliptical trainer, and stepper.    ADVANTAGE - Combining power from the power supply and power generated by the user enables less power to be drawn from external power sources, e.g. commercial electricity, and the amount of electrical power used to operate the exercise machine and the costs of electricity used to operate the exercise machine in gym and/or workout center are reduced. Electricity generated by a user on a first exercise machine can be used to power a console and/or other electronics on a second exercise machine, e.g. when there is a surplus of user-generated electricity at the first exercise machine. Enables a user to select a level of effort, e.g., a workout resistance, independent of power draw required by the console and/or additional electronic devices, e.g. television, smartphone, tablet computer, and Apple iPod (RTM: portable media player). Resistance levels provided to the user, e.g. to simulate a more strenuous workout, are controlled to ensure that the user still feels the same amount of resistance regardless of the electrical power that is generated by the user.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) an exercise machine; and    (2) a tangible machine readable storage disk or storage device comprising instructions which, when executed, cause the machine to perform the method.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of the exercise machine, such as stationary bike.    Exercise machine (100)    Pedal (101)    Power supply (110)    Commercial power source (115)    Console (120)