Jumping Pillow

We take the kids swimming most Saturday mornings, and the pool where we go to swim recently opened a 'Jumping Pillow'. I've never seen one before - I guess it's like a bouncy/jumping castle but without sides. It's a huge thing and is surrounded by sand so there's a safe(ish) landing if you inadvertently bounce of the edge.

The kids love it (and let's face it every adult on there does too) and it serves to wear them out a bit more after swimming class.