You should have lost weight elsewhere, but I didn't see you exercise your shoulders and arms.
So it looks like shoulders and arms are getting thicker.
In fact, aerobic exercise is like turning a "big pear" into a "small pear" Although you have lost weight, your basic figure has not changed, so you need to practice equipment, especially targeted equipment.
But how to practice the equipment is also divided. As a girl, you'd better practice endurance with equipment, so as to reduce fat and shape.
Specifically, each group 18 exercises are divided into 4-6 groups, especially the last few times of each group. Persistence is very important and plays a key role in reducing fat and shaping!
When you go to the gym, ask the tour coach to practice your shoulders and arms and ask them to teach you how to do it. Then you can choose your own weight to practice endurance, and you can definitely practice your shoulders and arms beautifully and have a sense of lines!
In a word, fitness can only make your figure better and better, and your figure more and more beautiful, and you will practice less, and there will be no obvious change in 3-4 days. Keep looking for 3 months, your figure will be better than before, and you will be more beautiful when you put on your clothes!
I hope my answer is helpful to you!