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
Speed-ball in a base from 40 kg to 90 kg. The ball is elliptic and is hit with a rigid plastic racquet with a small handle and a strings around 25 cm of diameter. The speed-ball court is about 6x4 m. for the single match and 8x6 m. for the doubles. Speed-ball is played alone (super-solo), with two players (single match), or four players (double match),or four players (relay) In "Super-solo", the aim is to hit the ball a maximum times in one minute. At first with the right hand, then a minute again with the left hand, then with two