This tell made Martina Navratilova a poaching machine

Martina Navratilova's absolute favorite time to poach was in the ad court when her partner hit a body serve and the returner moved to the middle of the court to hit a backhand. When she saw that "tell," she'd poach every time, because the returner basically has to pull the ball crosscourt. It's extremely difficult to push that ball down the line. So keep an eye out, and when you see this tell, poach!