Because thanks to some new technology in the home fitness sector your going to need it.
You can now work out and generate electricity from your own physical exertion. Apparently one workout session can generate enough energy to keep your smart phone charged up for a week.
At the moment there are two options to choose from; elliptical cross trainer and a bike. Unfortunately it’s only available in the US at the moment but here’s hoping Ebay can help us out soon.