"Balance First, Pedal Next Approach to Learning to Ride a Pedaled Bicycle" by KaZAM LLC:

Learning to ride a pedaled bike has little to do with training wheels and everything to do with balance. The KaZAM ™ is the only balance bike on the market just like it. Our patented design enables kids to gradually build confidence and eventually use the foot rest to truly have the same sensation and balance as when riding a traditional bicycle. While riding, Children lift their feet up naturally and position them on to the foot rest as they maintain proper balance and center of gravity. It is the most realistic approach to learning coordination and balance; and ultimately teaching kids how to ride a pedaled bike.