Gaiam sliding core discs work to engage and strengthen your core. They are dual-sided for use on both carpet and hard floors and are ideal for home exercise to incorporate into your workout routine. These fitness sliders can be used most anywhere and on-the-go, whether in the comfort of your home or your local gym. These gliding discs work to engage and strengthen the core muscles to target key muscles with a variety of exercises such as lunges, squats and upper-body movement.