Invite a friend to test their lung capacity with the tube, which keeps a foam ball floating when you blow into it. After a quick demo, tell them the longer it stays up, the better their lung power. And then surprise them with a blast of flour!!
Invite a friend to test their lung capacity with the tube, which keeps a foam ball floating when you blow into it. After a quick demo, tell them the longer it stays up, the better their lung power. And then surprise them with a blast of flour!!