Vest line refers to the lines on both sides of abdominal muscles, which is a healthy posture. To have a vest line, you need to do some specific exercises. Here are some fitness exercises that can help you have a vest line:

1. Sit-ups: Sit-ups can exercise rectus abdominis and transverse abdominis, which are the main components of vest line.

2. Push-ups: Push-ups can exercise the pectoral muscles, triceps and triceps brachii, and these muscles also help to shape the vest line.

3. Side plate support: Side plate support can exercise external oblique muscle and internal oblique muscle, and it is also an important part of vest line.

4. Running: Running can help you reduce abdominal fat, so it is easier to see the vest line.