Training is very simple. You can make it do whatever you want, but there needs to be a premise, "You need to give it food." Which is a reward. Without reward, it won't listen to you.

The four-month-old German shepherd is still in infancy, afraid of what it will do, and it is afraid of you.

I think you have two situations now. First, you don't want to hit it; Second, physical excess, that is, less exercise.

You prepare some diced chicken or dog food, because they are all grain by grain. When it doesn't eat, first train it to sit down, press its ass with your hand, and say "good dog" and reward it. Demu is very clever and learned it after three or five times.

Then teach it to "get down" and "shake hands" in the same way,

After the dog learns to get down, you can make it "quiet". If the dog doesn't move or make a sound, it will be praised and rewarded in 3 or 5 seconds. If it moves or barks, it will roar loudly and then come back. After proficiency, the time can be extended according to the situation. Finally, the dog may lie there for an hour without moving. However, this is a long-term and arduous task. You can't expect 1, two months. You should be prepared for 1 year or longer.

I hope I can help you.