Sunny Health & Fitness Roller Slide EXCELLENT CORE WORKOUT: The Ab Wheel requires your core muscles to work together to properly, resulting in optimal core and spine stability. The roller provides enhanced resistance then guides and assists you back in a fluid, controlled manner. CORE STABILITY: Your spine maintains its optimal position when your ab muscles are well-balanced. Exercising with an ab wheel requires that your core muscles work together to properly execute the movement, resulting in optimal core stability. FOR ALL FIT LEVELS: Beginner to advanced enthusiast can build core muscles progressively. Start from a kneeling position to learn the technique. Once you have mastered the movement, roll in different directions with knees up for a challenge. COMFORT: Protect your knees with the foam kneepad (included) that will offer comfort and support. Padded hand grips will help minimize hand fatigue while maximizing your ab workout. DURABLE CONSTRUCTION: This durable abdominal roller is excellent for smoothly descending your body down and hoisting back up. Four ergonomic wheels provide a smooth motion maximizing core results and amplifying your workout.