What is the best practice drill that you have ever herd of or have used? What drill brought about the greatest amount of improvement in your game?

Post drills and any information you think may be helpful to others.
Thank You 
As a general thing, drills should be "progressive" as described in the December 1992 article at http://www.sfbilliards.com/articles/BD_articles.html where a lot of the other columns describe progressive drills for various shots and levels, including a progressive masse drill.MichaelKendall said:What is the best practice drill that you have ever herd of or have used? What drill brought about the greatest amount of improvement in your game?...
That looks like a good one that could be made progressive by adding balls. Start with four and if you get through all of those, try five your next time. If you do five go to six. But if you fail to get through all the balls, you have to drop back to one fewer balls on the next try -- you have to "earn" a shot at more balls.Gregg said:... Try to runout in rotation, coming off the back rail first;
I do this drill, only without running into another ball, and not using any rails.Gregg said:First off, listen to Bob Jewett before a nitwit like me.
Second, the drill that I feel kept my focus and improved my game over the past few years is a drill found on Burt Kinister's "The Short Game".
Try to runout in rotation, comming off the back rail first;
Cheez Dawg said:I do this drill, only without running into another ball, and not using any rails.
I got it out of the book "Black Belt Billiards".(I think)
Cheez Dawg said:I do this drill, only without running into another ball, and not using any rails.
I got it out of the book "Black Belt Billiards".(I think)
Gregg said:First off, listen to Bob Jewett before a nitwit like me.
Second, the drill that I feel kept my focus and improved my game over the past few years is a drill found on Burt Kinister's "The Short Game".
Try to runout in rotation, comming off the back rail first;
mszelis said:From what I know, progressive drills are the best especially because you can track your progress over time. They say the most important shot in pool is the stop shot so I would only think that the 'most important' drill would be related to the most important shot. In my opinion, putting the object in the middle of the table and then shooting a stop shot (from progressive distances) into the corner pocket is a valuable drill. It will help you pocket balls from a distance, learn how to make the cue ball completely stop, but most importantly point out any flaws in your stroke.