Do not confuse activity with achievement. Achievement always involves activity of some type, but not all activity is productive, let alone beneficial.
Whether you are in school, at work or at play, take care not to whip yourself into activity for any other reason but specific, purposeful achievement. The energy you will free up on this basis will astonish you and give you that extra minute, hour or day you wish you had from time to time!
Gregory Hake 
Another way of looking at it is “majoring in minors”. Salespeople are often masters of this; they keep active with busy work but never achieve anywhere close to what they could because they don’t have time for the major things (such as prospecting for example).
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My dad called this spinning your wheels, using lots of gas but going nowhere.
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Such a great point Gregg. Thank you.
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