This is normal. When you start fitness, your muscles will grow and your body will become tighter, which may cause your clothes to feel tight. In addition, if you start a diet plan, you may gain some weight, which will also lead to tight clothes.

However, if your methods of fitness and diet are unreasonable, such as overeating or excessive exercise, you may gain too much weight and tighten your clothes. So I suggest you take scientific and reasonable methods in fitness and diet to avoid this situation.

Generally speaking, if you find that your clothes are getting tight, don't worry, it is not necessarily a bad thing. However, you should continue to adhere to a healthy lifestyle to ensure that your body can maintain its best condition.