I found it broke up touch typing into just the right size chunks to engage me.

At the start of Covid, I spent a week doing half an hour a day. My typing speed and accuracy improved out of sight. The whole process of acquiring muscle memory is quite magical. I highly recommend it.

[1] This is the companion site to http://www.speedcoder.net/, which is for coding, and presumes you start with reasonable touch typing skills on normal text.