We got The Kids a balance bike from Woot! I was very excited about it because it helps to teach them to balance on two wheels on a bike that they have more control over. So no need for training wheels when moving to a big bike its something they already have the skills to do.
The bike is small and you push yourself with your feet Flintstones style it does not have peddles so that your feet are always near the ground preventing tipping and as you get more confident and skilled you can lift your feet up and go with less contact similar to a skateboard or scooter. I think its a great idea and it will hopefully reduce the amount of crashing that happens when we move to a big bike.