Oops---I didn't mean by mouth LOL! You can use many different kinds of pumps to inflate the balls. Fitter1.com (and other suppliers) have both balls and the pumps to inflate them. If you're looking for a fast inflate, you could even use an air pump (though watch for overinflation). Also, I just got a tip on inflating: when you do the initial inflation, only go to 80% capacity. Wait 24 hours, then inflate all the way. If the ball is too hard for your liking (the Paul Check heavy duty Dura balls are hard----hmmm, one could read that sentence in a very strange way) you can overinflate a bit, then wait 24 hours and remove some of the air.