1. The design of sports vest or fitness vest is usually tight, which can show the body lines well, and it is also convenient for the fitness coach to better observe and guide the students' movements during the exercise.

This kind of clothes is usually used for sports, and its design can provide better sports support and comfort. And because they are usually tight, they can show their body lines well, which is very important for fitness coaches, because they need to guide their movements by observing the students' body lines.