a human power generation system includes a generation module and a generator . the generation module includes two speed - up great sets and a rack . each speed - up gear set includes a shaft to which a pinion and a gear are coaxially mounted . the pinion of the first gear set engages the rack . the gear of the first gear set engages the pinion of the second gear set . the gear of the second gear set is drivingly coupled to the generator . thus , by attaching the system to a wearer by a mounting device , the systems continuously operates by the natural activity of the wearer and the rack drives , through the gear sets , the generator to generate electrical power .