Answer: Dear [Friend's Name],
I wanted to share with you my experience of trying something new last week. I went indoor rock climbing, which was a first for me, and I thoroughly enjoyed it. The gym had different levels of difficulty for the climbs, which made it challenging yet manageable.
What I liked most about rock climbing was the combination of physical and mental challenges. It was a fantastic workout that also required problem-solving skills to figure out the best way to climb each wall. The feeling of accomplishment when I reached the top was amazing.
I would like to invite you to come rock climbing with me sometime soon. It's an excellent way to stay active, challenge ourselves, and have some fun. Let me know if you're interested in joining me.
Looking forward to hearing from you!
from [Your Name]