Let's see, place a piece of paper the size of a dollar bill under the rider's leg and see who makes it around the arena without losing it. Place two barrels at each end. Pick up a tennis ball from one, head for the other and set the ball on the upended barrel. If it falls off rider has to dismount, remount and set the ball again. Two barrels make it a race. It's fun even at a walk and certainly helps the kids with balance and confidence. I use three balls per barrel. Ride horse to one of three pails set upended, dismount on to pail, walk across other two and remount. You can time that one with your watch. It's amazing how many horses won't do this but have a log or trot pole on the ground, begin to ride over the log but stop the horse before a hind steps over. Wonderful for teaching timing. The horse has to settle and wait for the rider to ask it to move on. Of get half over and side pass off the end. The log helps the horse more than the rider.