John told Twitter followers, "I really can't swim. Today I took my first swim lesson since I was like 5. My dad learned in his 60's so I feel like I'm ahead of schedule."
His followers sent the 10-time Grammy winner lots of encouragement. But one famous follower's response may help him conquer his quest.
Kristy Kowal, a US Olympic swimmer who won a silver medal in the 2000 Sydney games, responded to the dad of two's post.
"Moving to California this week! Let me know if you want lessons for you and your kiddos!! #swimmingolympianforhire," she wrote.
What do you think of John learning to swim? Let us know in the comments.