Use the Obsidian Slide Board as a cardio device to slide back and forth to burn calories or you can follow the included DVD’s for a full body cardio & muscular workout. Mitts and booties are included with your Obsidian Slide Board and allow anyone to use this awesome fitness product regardless of sex, age or the outfit they are currently wearing. This model of the Obsidian Slide Board is 5 ft long. Slide boards are indeed used most commonly by speed skaters and hockey players. Research shows a connection between hip stabilizer weakness and running injuries and a good form of exercise to strengthen these muscles is the slide board most certainly.Obsidian Slide Board has a lifetime guarantee to ensure your satisfaction.