The Doubles Tandem guides partners to move as a team. If they don't, the Velcro strap tells them with a quick and sudden tug before separating the team at the Velcro connection. 

For simple movement and agility, hook up 2 young athletes and have them play tag, alternating who is the runner and who is the chaser. Just set up a marked area to run in. If the runner pulls away to separate the Velcro connection, the runner wins a point. If the chaser tags the runner, the chaser wins. Great fun while developing skills needed for covering a receiving in football, running or defending in soccer, as well as developing all-around agility and quickness for basketball, baseball, and many other sports.