This is an example of a hand check foul. A defender cannot use an extended forearm on a ball handler to illegally impede their progress, affect their balance and speed or delay their dribble. In this example, ball handler Purple 11 is moving the ball up the floor in transition when defender Black 21 places his left extended forearm on the right hip of Purple 11. The illegal contact impedes Purple 11’s progress in transition, affects his balance and speed and delays his dribble as he attempts to get past Black 21 to continue his move to the basket. This is a hand check foul by Black 21 on Purple 11.