Are Balance Bikes For Kids Worth It? I Asked A Physical Therapist
Briefly

Simply put, a balance bike is a two-wheeled bike with no pedals and no training wheels. It's propelled entirely by a child's initial 'push off' from the sidewalk. That means it keeps their feet close to the ground as they continue to occasionally push themselves as they roll and steer.
With a balance bike, your child's initial momentum starts with their feet on the ground (as opposed to on pedals). This lays the groundwork for the switch to a pedal bike and possibly skips over the need for training wheels.
Read at Scary Mommy
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