Yep, you just spoke the exact truth! While I don't lunge the horse I ride, I check him over for injuries, soreness, etc. while grooming him and doing groundwork. Like I said in a previous post, it also gets his attention back if it wanders if he's falling asleep.To me you can never do enough ground work or should never stop regardless the age of the horse. Just like athletes go back to basics sometimes to give their body a break or to refresh the foundation that brought you to the top. Since we start at the bottom and work up, not start at the top and once in awhile go down it is always good to go back to the basic again. My horse does really good if I take time off of riding and do lunging exercises or long lining. He gets a better grip on balance, transitions, etc. So when I go back to riding, even if I only took a one week break, he is way easier to ride and more understanding instead of bracing against me. Also from the ground it is easier to see an issue. Say he isn't wanting to turn a certain way, I'll lunge him or ground drive and see if I can see a problem and fix it. Maybe it's medical so he gets that taken care of, or maybe needs extra help to rebalance. Which is much easier on the ground. Hope that makes sense!