The ElliptiGo is a portable road bike you don't pedal the usual way. A hybrid between a bicycle and an elliptical trainer, the ElliptiGo is powered by long flat pedals you push your feet up and down on while standing (there's no seat). That action is easier on the joints than regular bike pedaling, and takes advantage of gravity, while providing a good cardio workout on the road. Available in three models, ranging from 3- to 11-gear systems, the bikes have adjustable and removable steering columns and removable front wheels for storage and transport. An optional stationary bike mount lets you use the ElliptiGo as a stay-put exercise machine. All this innovation doesn't come cheap, but it's no more costly than a high-end treadmill — and much better for sightseeing.