Not only great fun and exercise, but also an effective lesson in teamwork and communication. Foam bottoms prevent slipping indoors and out. Perfectly safe, with no straps to bind feet and cause twisted ankles. They sit only 1-1/2 off the ground, so beginners and younger users won't get hurt. Remember, the only way to Co-Op-A-Walk is to co-operate! Walking on Your Co-Op-A-Walk Coordination: All persons must raise the same foot and pull up on the rope on the same time as the foot they raise to keep the Co-Op-A-Walks against their foot as they raise it. Cooperation: All persons must then move together requiring complete cooperation with one another. Communication: All persons must talk, listen, read and send body language so that they will be able to walk together.