How to Balance Speed and Precision in Dog Training

I on needed a lot of how to stay still. He the speed and the go and the drive came for free for him. So he's really delayed in his training compared to my other dogs of like being stay put. And I am into the dog being able to stand square in very good position, sitting down. Because shepherds don't have great bodies,. because I have injuries in my older dogs, I am very, very into the conditioning right now.