The importance of undulating between external and internal (or concrete and abstract; technical and intuitive) training applies to all disciplines, and unfortunately the internal tends to be neglected. Most intelligent NFL players, for example, use the off-season to look at their schemes more abstractly, study tapes, break down aerial views of the field, notice offensive and defensive patterns. Then, during the season they sometimes fall into tunnel vision, because the routine of constant pain requires every last bit of reserves. I have heard quite a few NFL quarterbacks who had minor injuries
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