Dear [Имя подруги],
Thank you for your lovely letter! I completely agree that sport is important; it keeps us healthy and energized. I enjoy playing basketball with my friends every weekend. We have a great time practicing our skills and teamwork. We have participated in a few friendly competitions, which are always exciting! How about you? Have you ever thought about joining a team or competing?
Looking forward to hearing from you soon!
Best wishes,
[Ваше имя]