We ask participant to stand in couples, to look in the same direction and tied the legs that are closer together.
As a warming up ask the participants to practice walking, running, jumping together. You could also use directions (jump, touch the floor, step forward, step back) and after they have done a few series ask them to do the contrary of your directions. If you say “jump”, they “touch the floor”; if you say “step forward”, they “step back” and so on.