Anyone who watched Premier League football between 2008 and 2012 will remember Rory Delap's long throws for Stoke City.
The potency of the 'Delap special' - when he hurled the ball into the penalty area from the sidelines - filled opposing defences with dread.
However, bar that brief spell when Delap defined an era for Stoke, throw-ins have been one of football's untapped resources.
Delap showed what was possible. But there must be more tactical possibilities for a set-piece that operates outside both the offside and handball laws.
About 35 times every match an outfield player is allowed to throw the ball on to the pitch, often from a position only approximately close to where it went out of play.