ProGliders work your core and glute muscles during every move. These versatile disc-shaped gliders can be placed under your hands or feet during bodyweight moves to add dynamic movement to your strength workout. They come in their own carry case and you can take them anywhere - all you need is floor. These are two sided depending on your surface - the shiny side is for carpet or ruga, and the black side is used for tiles, wooden floors and other hard surfaces.