What you have done has little effect. Push-ups can exercise all muscles, especially the pectoral muscles and biceps, and also have an effect on abdominal muscles. However, if you are knee-oriented, you can only lose weight frequently, which has little effect on your muscles, that is, the muscles on your arms will feel tired and your abdominal muscles can hardly exercise. The reason why I feel tired is because I am in poor health and don't exercise often.

I suggest you not do strength exercises for the time being. Keep running for a period of time every day and do squats, preferably with light weight. The most common and effective method is to do some sit-ups, which makes it easier to build abdominal muscles. Do several groups every day, but don't be eager for quick success, or you will have a stomachache, step by step, and you will be a little sour a few days ago. If you persist, you will be able to solve your problem in just one month. By the way, watch your diet.

I wish you success O(∩_∩)O