Exercise ball a chair because of ergonomic considerations or biomechanical reasons. This large plastic ball, known as a "birth ball", can also be used during labour to aid the descent of the fetal head into the pelvis. Sitting in an upright position will also aid fetal positioning and is more comfortable for the woman. Sitting on the ball with arms placed on a bed, table or otherwise sturdy object for support and gently rocking the hips may help the woman during contractions and aid the natural physiological process of birth. Exercise ball An exercise ball, also known as a Swiss Ball, is
Rolling ball sculpture are typically made of wood or plastic and feature small, interlocking pieces that can generate a large number of track configurations. More complicated add-ons, such as jumps, loops, trampolines, xylophone ramps and electronic triggers are also typical with more complex sets. Examples of commercial rolling ball sculptures include Spacewarp from Bandai, Techno Ball, and Chaos Machine. Some hobbyists and artists also enjoy making the sculptures themselves using wood, metal, paper or plastic. General sites Specific creators <br> Rolling ball sculpture A rolling ball sculpture (sometimes referred to as a marble run, ball run, gravitram, kugelbahn, or rolling ball machine) is