Young people 15–18 years of age spend most of their time behind their desks at school. Fatigued from many hours of stationary work, they require a change. To help them there is Rocker, which allows the user to adopt two positions – high and low. The first is similar to riding in a saddle, a position arrived at after ergonomic research on what helps sitters to maintain the natural curve of the spine. In the second position, when you lean forward, it facilitates a free rocking movement, and when you lean even more, the movement becomes an exercise. The seat is made of two symmetrical components made of expanded polistyrene, and covered with a material using Line‑x technology. This makes Rocker light and safe, and inexpensive to produce. The compact dimensions also make it suitable for small interiors.