Problem: Pony cuts the corners.
Most school ponies know that cutting the corners means they can go slower and do less work. That’s smart! But when they do that, they’re ignoring you. Instead of waiting for your suggestion, they’re already heading for the middle of the next side.
* All ponies slow down a fraction before doing their own thing. This is to test you. If you don’t notice, they’ll carry on with their own agenda. So notice!
* As you approach the corner, see if you can increase the speed slightly. Keep your inside leg on. Take charge. Look where you want to go and steer.