As your army faces the enemy and the enemy appears powerful, try to attack the enemy in one particular spot. If you are successful in crumbling that one particular spot, leave that spot and attack the next, and so on and so forth, as if you were going down a winding road.” - Myamoto Musashi (1584 - 1645)

Myamoto understood productivity and how to get things done.

Break the problem into its smallest parts. Then attack the first task.

Once you’ve tackled that particular task, go on to the next, and “so on and so forth, as if you were going down a winding road.”