15 Losers into the Left Centre Pocket in English Billiards by Rob Hall

Here we have a video showing fifteen consecutive Losers into the Left Centre pocket.
As you can see in the video the contact points and spin vary depending on the position of the red ball. The aim is to keep pushing the red up and down the same line each shot to leave you the same (or very similar) shot again.
This is a great practice exercise to get the cue arm going.