Ball Retrieval is an excellent warm up game. It allows for coaches to tap into the natural imagination of the typical Under-6 player. The video shows a coach just requesting that the player go get the ball and bring it back to him. Coaches can vary the drill with having the player bringing it back with their "favorite foot" or their "non-favorite foot". I have made players bring it back kicking it in the "crab" position or using their heads without picking it up. You are only limited by your own imagination.