Good video; and very helpful. I always did like to jump the grid. It's a good exercise for rider balance, too.
Really liked the grids video, will really help with my new horse, we are just starting him in jumping.
In the lazy horse section she should have stoped and tried agin when the horse broke in a trot then keep her heel on the horse so he won't break into a trot .For the horse that was to fast should have troted it first.Then done it when he was more collected at a canter.In the one where the horse keep going side ways over the jump they should have slowed the aproche so they could come in the middle of the jump.
Thanks for a great video and article. Grids are a fantastic way to get the lazy horse to perk up or the speedy horse watch his feet. I use them all the time