It doesn't mean that you have to gain weight and eat high-fat things to torture you. You say that as long as you keep exercising every day, such as doing push-ups, sit-ups and leapfrog, the amount of exercise will increase, your roommate's appetite will increase and your muscles will grow at the same time. As long as you stick to it, you can build muscles without always eating well, and you can lose weight by eating meat once or twice every 3 5 days. It's not that you need to keep practicing for a long time, or that big fish practice drying nets for two days in three days. As long as you insist on not saying that you are thin, your muscles will come out in half a month at most, and you can do sit-ups and push-ups without equipment. If you are worthy of connection, your muscles are squats and leapfrog.