We did the grassy field thing with both our kids. The problem is the training wheels. They learn to ride one way with the wheels and then have to learn again without. If I had to do it over, I would buy one of those new balancing bikes without pedals or drivetrain. Or just remove the drivetrain from a small bike. Let the kids scoot around like Fred Flinstone and learn how to balance and steer on two wheels. Then the transition to pedaling should be easier.