(1) Strengthen self-defense: while dodging, stand upside down and learn to protect yourself. Even if you are attacked alone, you can still escape safely, thus repelling the invasion and protecting yourself.
(2) Optimize posture and improve body lines: Taekwondo's unique exercise method can greatly increase people's physical flexibility and dexterity, and make the leg lines more beautiful and strong. In addition, the training of special postures, such as chest-lifting, head-lifting and waist-straightening, is of great benefit to maintaining the graceful posture of women.
Training for two days a week is more suitable for amateurs, especially girls. It won't affect your study life because you are too tired, and it won't be too sparse to remember technical movements.
I don't know what you mean by "being an apprentice". Taekwondo is fast and flexible. Compared with other fighting techniques, it is not easy to thicken its legs.