This article outlines the design of a machine that can be used in the gym for generating electricity in the process of exercising. The growing demand for energy coupled with diminishing resources increase the need for switching to renewable energy. Human power is one renewable source of energy that would make a gigantic difference as far as energy is concerned. One of largest sources of harvestable energy is the gym where energy that could be harnessed is wasted through sweat. In the fast growing demand for energy the designed machine reclaims that energy. The energy crisis is further worsened by inefficient use of energy hence there is need to also practice energy efficiency and conservation. The proposed design replaces convectional “power-hungry” treadmills that uses electric motors with power ratings up to 4.5 horsepower therefore saving about 66% of the electrical energy used in gyms. Research carried out by the authors show that, of the more than 30 registered fitness centers around Harare, most of them have monthly electricity bills that range up to US $3000.