1Effective. Experience a visible body change. Low impact on joints in low-frictional weight-bearing workouts. 2Break body adaptation and burn fat to reveal leaner, flatter abs. Improve quickness, stability, coordination. 3To perform core slider exercises you need sleep-bag-size place. 2 sliders spice up home gym, aerobics, calisthenics, street workout, etc. User friendly for beginners. 4Smooth sliders engaging your core. Use for intense workout, quick reps, large hands and feet. Adjust and shape muscles that are hardly used. 5Slippery-proof. Training muscles and have control of your body. 6Double sided for all surfaces. Polished plastic side is used down on carpet/rugs, foam side down on hard wood/laminate floor. 7With portable bag, can carry sliders anywhere at ease. Mind you. Using a wrong side scratches your floor.