As in most inflatable balls, there is a small opening that allows the pressure to be increased or decreased.

Let's put on our cossies and throw some inflatable balls!

These inflatable balls are also quite popular for solo use.

The 15-foot inflatable ball was placed in a new location each day of the festival.

A couple of big inflatable balls were floating on the surface.

Midway through the game, someone threw an inflatable ball onto the pitch.

Fresh water is taken out by the pilot using the side tube that leads to bottom of the inflatable ball.

Later, you may use an inflatable ball called a Swiss ball or other simple equipment.

A beachball is an inflatable ball for beach and water games.

Lie on the inflatable ball to do your exercises.