Consumer Reports

If you want a great ball for working out that is supportive and durable, check out the GoFit Pro Grade Stability Ball. Its surface texture is unlike any other — it lacks the ubiquitous ribbed design of the other balls but still provides a patterned grip. There are a series of exercises printed right on the ball for quick reference, and it comes with an exercise manual and DVD for coaching or extra motivation. As one of the thicker, heavier balls in this review, you can expect it to stand up to actual workouts for much longer than the less supportive ones.
On the downside, if you want this ball for use as a desk chair, especially at the office, you may not be thrilled with the look of the exercise cartoons printed on the sides. You also don't get to choose your color preference, as one specific color is associated with each size. And similar to most of the higher quality choices, proper inflation takes more than one day. GoFit recommends you leave it partially inflated overnight before commencing to full inflation. If working out is your primary intention, the GoFit Pro Grade makes a great choice. 

OutdoorGearLab

If you want a great ball for working out that is supportive and durable, check out the GoFit ProBall. Its surface texture is unlike any other — it lacks the ubiquitous ribbed design of the other balls but still provides a patterned grip. There are a series of exercises printed right on the ball for quick reference, and it comes with an exercise manual and DVD for coaching or extra motivation. As one of the thicker, heavier balls in this review, you can expect it to stand up to actual workouts for much longer than the less supportive ones.
On the downside, if you want this ball for use as a desk chair, especially at the office, you may not be thrilled with the look of the exercise cartoons printed on the sides. You also don't get to choose your color preference, as one specific color is associated with each size. And similar to most of the higher quality choices, proper inflation takes more than one day. GoFit recommends you leave it partially inflated overnight before commencing to full inflation. If working out is your primary intention, the GoFit Pro Grade makes a great choice. 

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expert-review

Best Exercise Balls

Wirecutter

This ball comes with everything you need to start using it, although we recommend an alternative inflation tool.

bazaarvoice

As sturdy as our pick and sold in as many sizes, this model is a solid choice for most people (and recommended if our pick is unavailable).

Stability Ball Comparison