The I-formation in American football is an offensive alignment with backs stacked behind the quarterback. One back lines up directly behind another. This formation emphasizes downhill running. Coaches value its balance and structure. Play-action passes work well from this look.
Defenses must respect the run threat. Blocking assignments stay clear. Fullbacks lead through the hole. For example, a tailback follows a fullback for a power run. Therefore, the I-formation supports physical football.
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