j/fit Inflatable Balance & Stability Disc: 13" Large Yoga Wobble Cushion Trainer with Pump - Core Fitness & Workout Equipment Discs for Home - Office Chair, Ankle Strength Training & Dog or Pet Activity IMPROVES STABILITY AND CORE STRENGTH: The j/fit Balance Disc helps you improve your balance, coordination, posture, flexibility, and core strength; portable to use anywhere for a quick workout ANTI-BURST TECHNOLOGY - Rated to withstand up to 350 pounds, our balance trainer is molded with high-tensile materials; it's safe for kids and adults as a fit balance stand or wobble cushion chair MASSAGE SURFACE - The textured pattern improves grip and comfort during exercises, core strength training, yoga, or any muscle toning workout program LARGE SEATING AREA - At 13 inches wide, our fit discs are ideal for seated exercises, squats, ankle drills, even for dog and pet training EASY TO INFLATE - Unlike cheap quality substitutes, the j/fit balance disc is easily inflatable with the included inflation straw; adjust the air to your workouts for optimal results