What is an illegal shift in the NFL?

An illegal shift in the NFL is a five-yard foul given to an offensive team who do not present a legal formation before and after a shift.
NFL

Taysom Hill darts across the formation on nifty 17-yard pickup

Highlights from the Wild Card Weekend matchup between the Houston Texans and the Pittsburgh Steelers during the 2025 NFL season. Watch the top defensive plays from Wild Card Weekend during the 2025 ...