JoJo and her cousin Lexi are at the swimming pool with Gran Gran. It’s time for their swimming lesson with Reeni, and today they’re learning how to swim underwater. They remember it's breast stroke for arms and front crawl for legs, and they’re ready to go - but it turns out it’s a little bit tricky swimming underwater. It’s time for a Gran Gran plan and a little bit of practice with some sinkers. But who can help Panda when he decides to take a jump in the pool too?