Arc Block

An arc block (or arc release) is a curved blocking path where an off-ball blocker, typically an H-Back, tight end, or wing, bypasses the end man on the line of scrimmage (EMLOS) to block a second-level defender, such as an overhang linebacker, apex defender, or force safety.

In spread option schemes like Zone Read and Power Read, the defensive end is left unblocked as the read defender. The arc blocker looks outside-to-inside: his primary target is the apex defender or force player setting the perimeter edge. If that overhang defender widens with a slot receiver or drops into coverage, the blocker folds back inside to pick up the scraping linebacker.

Coaches distinguish the arc release from other edge movements:

Arc Release

Curving outside around the edge defender to seal perimeter support for a quarterback keeper or sweep.

Split Zone Sift

Sifting across the formation behind the line to kick out or seal the backside defensive end on an inside run.

Veer Release

Releasing inside across the face of an edge defender to climb directly to an interior linebacker on inside veer option schemes.