The choice of low environmental impact sources of energy is one of the founding principles of sustainability, but many people often forget that we have the potential to create energy via our own physical activities: walking, running, and cardio exercise. The British Great Outdoor Gym Company has created “Green Heart”; the first network of eco-friendly outdoor gyms capable of turning burned calories into clean energy. The Kilowatts produced by the users while they’re exercising enter a local energy network, so citizens can save on their utility bills. Additionally, all the electronic devices and equipment inside the gym get to recharge overnight, thanks to all the people working out during the day.
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