With the help of a tube (attached) can inflate the ball in no time. If you need for the next exercise a little less air, just briefly pull the plug and tuck at the desired amount of air again.
Especially for physiotherapy exercises I find this ball significantly better than the balls with the very smooth, shiny surface, as this ball here "grip" is.
In addition, you can pass quickly alienate purpose. As a cushion on the go (only half-filled with air), as water polo, traveling as a small sitting ball for children (3-4 years).
For the few bucks certainly recommended! :-)
