[Product Information]

• Stand， kneel， sit or do push-ups on this soft， unstable disc. Feels like you're standing on a pillow of Air
• Adjustable Air pillow with sports ball needle not included
• Versatile - Use one disc for single leg exercises and sit-ups. Use multiple discs for double leg exercises and push-ups. Set up in patterns， then Walk from one disc to another. Specifications: 14 inch diameter ; one smooth side， one ridged side