Requirements: One ball, at least 7 players - 3 throwers (T), 4 (or more) workers (W).
Players form a diamond, 1 thrower at each of 3 corners, two rows of workers at 4th corner.

T(1)

T(2). . . . . . . . . . . . . . . . . . T(3)

W(a) W(b)
W(a) W(b)

Both rows of workers start at the same time. W(a) throws ball to T(2) and runs towards T(2). At the same time W(b) runs straight towards T(1), receives pass from T(2) and passes onto T(1). W(a)runs around T(2) and towards T(3)receives pass from T(1) and passes onto T(3).W(b) runs around T(1) receives pass from T(3) and passes onto W(a) and returns to opposite row to where they started. W(a) runs around T(3) takes pass from W(b) and passes onto next W(b). Each worker returns to opposite row. The drill continues but in reverse - W(b) starts with ball.

Hope that makes sense!
Main Objective:
Emphasis on passing in front of players to ensure they run onto ball
From "Shazfly"