A Hong Kong gym and London dance studio are both powered by human power . Italian inventor Giuseppe Gambarota says human power is simple to use . Human power is rapidly gaining in popularity worldwide as businesses seek 'greener ' methods of operating . The concept could be applied to busy places like train stations or into homes . There are some questions about the economic sense of human power .
A Hong Kong gym and London dance studio are both powered by human power . Italian inventor Giuseppe Gambarota says human power is simple to use . The concept could be applied to busy places like train stations or into homes . There are some questions about the economic sense of human power .