Do push-ups every day or buy an arm strength machine to practice arm muscles.

Do sit-ups, or lie flat, then lift your feet together for 3 to 5 cm, and your abdominal muscles will feel sore. You can practice abdominal muscles.

Your weight is thin, so it is recommended to eat more beef during exercise.

Stick to it for a while, and the effect depends on how many times you can stick to it every day.

And your next problem, muscles will fade. Like Jackie Chan, he had eight abdominal muscles when he was young, but now he has only one. However, scientists have found that muscles have the ability to remember. If you had muscles before, it would be much easier to practice them from scratch than the first time. I tried this myself.