Balance balls are a great way to warm up before a session and if coming back from an injury, if carefully used, can allow a grappler to test out how they are feeling without the dangers of a live training partner. For beginners, they are an excellent way to develop spinal flexion and extension as well as flexing and extending the pelvis. Such motor control in the human body is vital to prevent being pushed and pulled by opponents, creating virtual, invisible frames with the skeletal system to create a structure that to untrained individuals, will make you feel impossibly strong.