also: run fits · fitting the run · fit
On defense, who owns which gap once the blocks show. On offense, the position your body is in when you make contact. One syllable, two unrelated things.
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The defensive assignment of every defender to a gap, an edge, or a space, resolved after the blocking scheme declares itself rather than before the snap. A defense is fit correctly when there is a body for every gap and nobody has doubled up, and most long runs are a fit failure rather than a missed tackle.
run fits, gap responsibilitythe offensive fit, run blitzOn offense, the fit is the body position at the point of contact: pad level, hand placement, hips, feet. Coaches fit players up before a drill, walking them into the finished position before running it at speed.
fit position, fitting uprun fits