Set up a 10 X 10 grid with cones. Place 3 or 4 players in a single file line. Have the first player start and tell each follower to stay as close to the person in front of them as they can without passing. Have the leader jog at a constant speed the first time around the grid. The second time around tell the leader to change speeds fast, slow, fast. After they finish talk to the group about how much harder it was to stay close to the person in front of them when the speed was changing.