Hi [Friend's Name],
Thank you for your letter! I usually spend my free time reading books and watching movies. I also enjoy jogging in the park. Yes, I do go in for sport; I play basketball with my friends. At school, we have a drama club, and I think I would like to join the art club because I love drawing and painting. What about you? How do you spend your time?
Looking forward to hearing from you soon!
Best wishes,
[Your Name]