This drill isolates the backbone of the defense: the CHASER, the MIDDLE, and the TAIL. These three must move in unison as the ball moves about the perimeter.
Four players are positioned around the perimeter with two additional players on the low blocks. The perimeter players move the ball randomly while the defenders practice their coverage responsibilities.
Source:https://www.breakthroughbasketball.com/defense/131-zone.html
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World Rugby has reportedly conceded Aaron Smith's disallowed try in the World Cup final should have stood.
"It is not only useful for staff who are experienced but a valuable tool for those subject staff who have to take teams."