Hi Josefa,
Why do I want to cover an exercise ball, which has a smooth surface? Because I sit on it when I’m working at my computer. In the winter, the smooth rubber surface is always cold when I sit on it. So I’ve always draped a blanket over it. But that’s impractical because the ball keeps rolling away, and the blanket goes with it. In the summer, you stick to it when you sit on it because the rubber doesn’t absorb moisture. So I always had to put a blanket over it then, too, which would get caught somewhere as the ball rolled away.
Conclusion: I needed a cover for the ball. So I crocheted one. Now it feels very comfortable temperature-wise and is also nice and soft. You move around much more when sitting on a ball than you would in an office chair. It’s both comfortable and a workout for the lower back. With the cover, it’s now perfect for me.
Best regards, Ina