My 15 year old mare has just had about 2 years off and I recently gave her a refresher as I will be putting her up for sale. She's now back to doing w/t/c without a fuss but I'm looking for some good exercises to build up some muscle on her again. I can't canter circles on the right side as she has an old injury that limits her movement so she cannot bring her leg as forward as it should be to canter circles. She is NOT lame on it, it just restricts her movement a bit. Also, I don't want to be building more muscle on one side so just cantering her on the left is out of the question.