After they get used to prascend, I think it's important to keep them active if they are sound enough to work. It might be slower work and I wouldn't try to move them up the levels of dressage or jumping or other vigorous sports, but I think it's good to keep them moving and at the same level of work they were in. It's important for weight control but also because it is good for them mentally to maintain their familiar routine. With my old horse he was unsound so it wasn't possible, but I think it helps a lot when they are sound enough. Agree that it should be checked annually.