The G-Bike is a sustainable cycle designed by Dongwan Jo; its USP is that it metamorphoses from an exercise bike to a road bike in a minutes. In the stationary-bike mode its electric battery gets charged the more it is used. On being transformed to a normal bike it purely works on the charge assimilated in the gym bike mode. Similar hybrid designs in bikes are being worked on in an attempt to save consumers a bit of money and space. Such environment friendly multifunctional bikes may very well be featured prominently in the home gym of the future.