The Ab Roller Black by Gorilla Sports is suitable for abdominal training in a small space. You need little space and save your knees thanks to the included mat. By training your abdominal muscles, you strengthen your core. You get a flat stomach and prevent back problems at the same time. For a slim waist: The Ab Roller Black has a weight of 650 g and rolls on a rubberized tread. Thanks to its soft, rubberized grips, it guarantees optimal training comfort. With the included mat you can train on hard surfaces without damaging your knees and you only need a space of 2 x 1 m for your abdominal muscle training. Whether you train your abdominal muscles for a flat stomach, a slim waist or a six-pack: Basically, for an optimal training success, you should first boost your circulation by warming up, as a second step perform the abdominal muscle training in several sets and finally finish the workout with stretching exercises.