Blowing the ball and pipe is great fun for all ages, and can get quite competitive in my household.
Similarly to humming, when we blow the pipe, we are circular breathing, as we exhale for longer to sustain the ball in the air; impacting our CO2 tolerance and increasing nasal nitric oxide, our natural germ buster.
To blow the pipe, the orbicularis oris (the circular muscle surrounding the lips) gets a workout, the tongue has to retract into a good posture, and the cheeks have to activate. All of these muscles have to work together, along with the diaphragm and the eyes and brain, which is great synchronizing all of these skills.
Keep that Christmas Cracker toy, this year!