The Core

That is cool!

We used to commonly have pegboards, but they're frustrating - if your aim isn't perfect, things go awry. The modern equivalent is a campus board, but that is linear and just for developing pure power (series of wood strips for practicing dynamic moves).

The thing that's cool about the maze is it forces you onto one arm then the other in a non-dynamic way.

Never seen one.
https://frictionlabs.com/blog/introduction-to-campus-board-training