@trisomy.18: It your neck or back hurts more than your core during an ab workout, your form is off and you're missing the target muscles completely. The MERACH Ab Machine takes the strain off your spine and isolates your upper, lower, and oblique abs with a smooth, guided glide. Stop wasting time on the floor doing endless planks and sit-ups that don't work. Upgrade your home gym setup, protect your joints, and finally feel the deep core burn on day one. #exercise #Fitness #workout #blackfriday #christmas