I have a nice five year old who is started on the barrels and is doing really good. She is a Playgun and Big As I am. I really like her. I feed her nice coastal hay and Purina Strategy Professional Formula GX twice a day. When riding her she is lazy. She wears me out trotting and loping her. I am constantly pushing her with my feet to go. I was wanting advice on a supplement that would maybe give her energy. Something that is easy on my pocketbook. She is wormed every six months. She runs and plays when shes out. 

There was a thread about this not long ago, I'm going to try and find it to bump up for you. 

It's called "Help... young horse doesnt seem to want to do barrels" I just bumped it up for you. 

Thank you very much. Lots of good advice.