Do more aerobic exercise when you lose weight in the gym, so you lose weight, but your muscles become slack. Now you can start strength training, because your body fat rate is very high from the beginning. If you only do aerobic exercise, you won't increase your muscle content. Therefore, when the fat rate drops, your muscles will become slack. Only by training your strength, connecting your muscles and increasing your muscle content can you repair the problems you are encountering. Attention to strength training: 1, make a reasonable fitness plan, such as how many days a week, what parts, groups and times to practice on which day. 2, diet planning, limit the daily calorie intake, increase the intake of protein, needless to say, high-calorie food, you should know not to eat too much. There are many high-protein foods, such as fruits and vegetables, bananas, yogurt, milk, avocado, eggs, beef, chicken, etc., which are rich in meat protein and can be eaten. 3. Whether to consider using supplements, such as protein powder and muscle powder. 4. Strength training is different from aerobic training, so you must warm up and stretch after practice. Fitness is a long-term exercise, which requires perseverance and persistence. I hope you can refuel. In addition, if you don't know how to do it, you can ask a tutor to help you when you have plenty of money, which will save a lot of trouble.