I do Parelli. The first level is all about groundwork and building a relationship with your horse. I have stopped riding until Vega and I build our foundation. The other levels are just building off of your foundation and making it into a partnership with your horse.
I did teach Vega to bow, by using carrots. She only puts her head between her front legs and move one leg forward a bit. I think it's really cool though.
Though I would LOVE to know how you taught your horse to sit.