I gave one suggested exercise in my post yesterday about Exercising the Choice Muscle, and there are several more suggestions from readers in the Comments.
Here’s one exercise which I don’t think anyone else has come up with yet, though it’s very simple and straightforward.
Write a list of five random tasks
Do them in the order in which they are written down
Then write another list, adding one more task, i.e. six
Repeat regularly adding one more to the total tasks on the list each time
You may not do any other tasks while doing this exercise. If you fail to complete the tasks or do them in the wrong order, then next time reduce the number of tasks until you do succeed in doing them.