Landlord, it's simple. Find someone and lie on your back with push-ups on your shoulder blades. The way of adjustment is also very simple. Adjust the position of that person's feet, that is, the harder that person bends his knees, the less weight he will give you. On the contrary, the more so.
This is my method. I also tried my best to do push-ups and weightlifting, and finally came up with this method, but maybe you don't adapt. Practice and you'll get used to it. Finally, you can make people lie on their backs. Now I can only make a 60 kg person do eight on his back.
I hope you like this method.
Find a specific and suitable person in advance and ask him for help. The better. Specific time.