Sorry it has taken me so long to respond!!!
I am a true believer in groundwork!! I have personally seen it transform my 3 geldings completely. They are all older horses and very set in their ways. They had picked up some very bad habits along the way that groundwork helped me correct. It also let's them know I"M IN CHARGE...the end. I can move you where I want you no matter what.
Like I said I use Clinton Anderson methods. I start from the very beginning with desensitizing. Now, my boys weren't spooky at all...atleast I thought they weren't until I tried some of the exercises. Thank god we weren't on a trail or on the side of a road because that would have set them off. Now they are calm as can be. Then we worked on disengaging hindquarters. VERY IMPORTANT!! Without knowing how to do this, you horse is pretty dangerous. This is a way for you to always have control in case of a run off situation.it's also nice to be able to swing that butt around anytime you need to. I can honestly now just look at my horse hindquarters and they will move. Working with backing up just by your energy is pretty darn helpful as well.
Next we work (on the ground) where the leg cues will be. I work all 3 positions with numerous different exercises. This lets your horse know what you want even before you get in the saddle.
Lateral flexions are done every day no matter what. It helps tremendously to get them soft and with your one rein stops. You'd be amazed at how many horses have trouble with this and are so stiff. My quarter horse could barely do it at first. Now he stretches like there's no tomorrow. I think it feels good to him. Kind of like when we strecth out.
There's so much more to list. I just wanted to scratch the surface just to point out why it's so important. (Now, for all of you disagreeing with me right now, I understand. But please understand that my horses were not bombproof. They needed A LOT of work and this was one way to achieve that)
If you have any questions or want to know HOW to do these exercises just let me know. It's a lot to type, and would prefer you were devoted to it before I type it all out!!