Keep KEEP Anti-Burst Thickened Yoga Ball

• Amazon now offers KEEP anti-burst yoga ball (thickened version) for $7.99 (regular price $14.99).
• 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 cause your lower back to slump. Swap it 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 without bursting suddenly. The matte surface provides anti-slip grip, so your hands won't slide easily during planks or crunches. Inflate it to about 70-80% full, and sitting on it offers a soft yet bouncy support that feels much more comfortable than a rock-hard ball.