One thing I'm thrilled to see FINALLY taking off in the states is balance bikes
If a kid starts on a balance bike instead of training wheels, they learn to ride a real bike way faster than with training wheels
Part of the reason for this is obvious: you learn to actually balance instead of having the training wheels do that for you
The other reason though is something called countersteering, which is one of those skills so subconscious it's basically impossible to verbally teach
You need to learn how to countersteer in order to reliably turn without falling, which is where a large part of the frustration comes in when kids switch from training wheels to real bikes
Balance bikes teach all of this naturally, and pedaling is one of the easiest skills to add
Training wheels are archaic, ditch them!