A supporting run made on the inside of a team-mate rather than around the outside — the inside counterpart to an overlap.
An overlapping run goes around the outside of the ball-carrier toward the touchline; an underlapping run goes inside them, into the half-space between full-back and centre-back.
Underlaps are effective when the winger stays wide and holds the touchline, opening an inside lane for a full-back or midfielder to run into and receive centrally.
The inside run arrives in more dangerous, central areas and pulls defenders inward, which can free the wide player for a cut-back or create overloads around the box.
Inverted full-backs and attacking midfielders frequently make underlapping runs in positional-play systems.
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