I like that your invention has multiple benefits, you have thought up a way to create sustainable, environmentally friendly energy and keep your body fit and healthy! Using the invention would also mean you could control the amount of energy you create too, so you remain aware of how much movement creates a certain amount of energy. This would help us be more aware of our energy demands, it is important to use renewable energy sources wherever we can! Great thinking P. Arjun, I look forward to your next invention.