Yellow (17"H) Use this therapy ball as a balance ball for core strengthening or as a giant ball for kicking, rolling and just playing around. Exercise balls are wonderful, fun and highly therapeutic. They strengthen core muscles and provide great seating options for kids who need to wiggle. Use as a balance ball when fully inflated to develop proper posture and sitting habits. This Therapy Ball challenges balance and righting reactions and is good for children who are sensory under-responsive and need good core positioning. Ages 3 and up.