When you have a large group of players as in a tryout scenario, take the number smaller groups you want to
divide them into and have the players count-off to that number.
For example, if you have 40 players and want to divide them into five groups, instruct the players to line up on the baseline and to count-off
by "5's". The first player shouts "1", the next shouts "2", and so on up until the fifth player shouts "5".
The very next player will start the count over at "1". At the end you should have the 40 players nicely separated into five groups of eight.
Make sure the little dummies remember their number!