First, do targeted training for muscles in different parts of the body and stick to it every day.
Male muscle training focuses on pectoral muscles, abdominal muscles, biceps brachii and triceps brachii, and training plans can be made for these muscles. Muscle exercise in every place has corresponding exercise methods, such as doing sit-ups to exercise abdominal muscles, lifting dumbbells to exercise biceps brachii and triceps brachii and so on. When the plan is made, all that remains is to carry it out, and keep training every day.
If you feel that you have poor self-control or don't know how to train, you can go to the gym to find a professional fitness instructor. Usually, the muscles of fitness instructors are quite developed. As long as you train according to their requirements, I believe you can also have one track mind.
Second, arrange your own diet reasonably and eat some foods with high protein content.
Muscles not only need to be practiced, but also need to be replenished. If you only practice and don't make up for it, your body will definitely not be able to stand it for long. How to make up? That is through diet. Personal diet must be reasonable, and protein's intake can be appropriately increased. Protein is very useful for muscle growth and fat loss.
Just like those fitness gentlemen, they eat a lot every day. They will also pay special attention to protein's intake, such as eating raw eggs, beef and protein powder. Only when the human body ingests enough protein, coupled with proper exercise, can human muscles become strong.