What's this?
Interleaved clicking up helps you solidify and bring a piece of music up
to speed by breaking it into chunks and clicking them up in a rotating
pattern. You start with just a single chunk and click it up. You then add
another chunk, and will be asked to play sections of varying lengths
every time you increase the speed.
This exercise was designed by Molly Gebrian. She
has a very good explanation and a demonstration of the process on YouTube.