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The Core Coasterв„ў is one of the most dynamic exercise devices ever invented. Incredibly versatile, users can tone and build nearly every muscle in their bodies with an amazing array of exercises from beginner all the way up to advanced levels.  NEW LARGER DESIGN – Larger more stable design. Includes 2 Core Coasters and Instructions Poster SCIENTIFICALLY PROVEN – Why would you buy an ab roller or exercise wheel when the Core Coaster has been scientifically proven by the University of Alabama to activate the obliques 435% more than a traditional crunch and 300% more than a pike. The Core Coaster is the most versatile core strength and stabilization exercise device! The Core Coaster combines the Ab Wheel, Sliders and Assistance / Resistance Training All in One Package! HANDS OR FEET – Ab Wheel / Roller with 360° Range of Motion. Strengthen your core and entire body! For any fitness level (1-4 levels). Limitless exercises! OUR GUARANTEE – We guarantee that you’ll love it or your money back! Portable, versatile, sturdy. Works on almost any surface – wood, synthetic wood, concrete, rubber gym mats, thin carpet, linoleum, astro-turf. The Core Coaster is patented. BY CORE PRODIGY – fitness product leader