Because we haven't been consistent about lessons, he isn't progressing as quickly as he would like. But even though there are younger kids levels ahead of him, he sticks with it. I'm really proud of him for not getting discouraged.
As a parent, taekwondo gets scarier as they level up. Each level they have to be able to break a board a different way. I have no idea how they do this without breaking themselves. But they're always so excited to have done it, no one complains.