Core Coaster - Ab, Core and Total Body Exerciser (2 Core Coasters) 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 get the best workout 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