Tag and pursue
See YouTube video - Tag and pursue.
Rebounding for perimeter players, tag the offensive player then pursue the ball.
Coach starts with the ball, X3 is defending 3 in a help (gap) position between 3 and 2. Coach passes to 2, who passes to 3, X3 closes out.
(Variation - when coach has the ball, X3 is in a gap position between the ball and 3, then moves to a gap position between 2 and 3 on the pass to 2)
3 passes to 2, X3 gets back to a help position.
2 shoots, X3 yells "shot", tags 3 with a forearm and pursues the ball.
See Rebounding - Weakside.