Keep KEEP Anti-Burst Thickened Yoga Ball

• Amazon now offers KEEP burst-resistant yoga ball, extra thick version, starting at $6.99.
• Prime members get free two-day shipping, and regular members get free shipping on orders over $35 within the contiguous U.S.
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Editor's Pick: Sitting at a desk all day can easily cause your lower back to slump. Swap your chair for this ball, and your body will naturally make small adjustments to your posture, engaging your core. Made with solid, thickened material, even if punctured by a sharp object, it will only deflate slowly rather than burst suddenly. The surface has a matte, anti-slip texture, so your hands won't slide easily during planks or crunches. Inflate it to about 70-80% full, and you'll get a supportive yet bouncy feel that's much more comfortable than a rock-hard ball.