Pure2Improve training wheel Training your abs in a fun and challenging way has never been easier. Place your knees on the floor, grip the handles firmly and roll the wheel away from you. How deep you lower your chest and how long you hold it determines how heavy the exercise is. The muscles in your back, shoulders and arms are also put under great strain with this exercise wheel Specifications: Colour: red, black Gender: unisex Material: plastic Dimensions: 25 x 5 x 22 cm (L x W x H) Weight: 500 grams