Divide the players into pairs and give them one number per pair.
When the trainer says a number, the players with that number sprint to the center as fast as possible, grab the basketball and dribble to basket for 1 to 1.
They get only 1 attempt to score. After their goal attempt, the ball goes back to the trainer.
You can also call several numbers at once for 2 against 2, 3 against 3 etc.