In short: practicing various shooting variants in a fun competition form.
Organization: per group a basket and a ball, the baskets are preferably (but not necessary) arranged in a circle or rectangle.
The number of persons per group is less important (but all groups are about the same size).
The first assignment for the groups is: score 10 goals.
When you have completed this assignment, the person who scored the last goal runs to the trainer to pick up the next assignment.
Which group completed all assignments first?
The trainer walks around, encouraging, or correcting.
He has a piece of paper with him with a row of assignments on it.
When someone comes to pick up the next assignment, first ask which one has just been done (this can vary considerably over time) and then hand out the next assignment.
An example list: 10 walk-through balls, 15 penalty shots, 5 8-meter shots, 10 walk-through balls from behind the basket, 5 dodge balls next to the pole, 10 6-meter shots.
Everything is possible of course, a lot of momentum is gained if the number of goals to be scored is kept small.