ground working materials
WS Arabians is absolutely right! No two horses are alike or can be trained alike. The key is when working with your horse be repetitive and patient. Thats how they learn-repetition. One thing that will help: Always make sure you are the herd leader (in your case you have a herd of 2) They learn a bunch from their herdmates. Maybe read up on horse psychology. I've learned a lot just by watching my horses as a herd.
Do not go where the path may lead-Go instead where there is no path and leave a dusty trail.