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Growing up I was in the marching band, in the drum section, which to me was the coolest section. As I was learning to play the drums we practiced rudiments - single stroke rolls, multiple bounce rolls, flams, paradiddles, ... Rudiments are the components that allow drummers to play various techniques creating the wide variety of sounds you hear in music. When first learning it took extra time to figure out how to control the sticks, how to keep the right beat, how to play the right sequences. We practiced slow at first then began to increase in speed. We practiced over and over and over again.
The same was true for the times I played sports. For example, in tennis we had a ball machine that would launch one ball after another to the same spot, where I would have to hit cross court forehands over and over and over again. This style of practice allowed me to improve my skills and become a better drummer and tennis player.
In the lean and agile worlds there are a couple of key aspects that allow us to practice.