The drill is designed to add an element of game-like pressure to shooting foul shots in practice. It forces players to concentrate at the foul line instead of just 'going through the motions'.
Divide the team in half and let each group go to a goal. The two 'teams' will start with a tie score, for example 50-50, and each player will shoot a 1 and 1. The first team to 60 wins the game. Obviously, if 1 player misses the front end and his 'opponent' hits, that team must wait until the opponent shoots the bonus. In this way each team has the same number of shooters.
All players on team
Play best out of 3 changing ends after each game. It should take about 10 minutes to complete the drill.
You may want to have the losing team run a sprint for each point they lose by. Another way to reward an individual is to make a rule that if you don't miss a shot but your team loses, you don't have to run.
Finally, you can add more pressure by announcing at the beginning of a game the loser runs a suicide per point instead of a sprint.
This basketball drill is licensed under a Creative Commons License. This drill is from Pål Degerstrøm at www.degerstrom.com/basketball.