Click through on MOTOR a skills category. Ask not what a product can do for you, but what you can do with a product. From gripping and manipulation, through crossing the midline; flexibility and range of motion to exercise and agility. Motor is a big subject, and almost every category has good encouraging stuff, VESTIBULAR AND INDEPENDENCE are particularly relevant for Gross Motor.
Other categories within Motor Planning
Peanut Roll Extra Small
Therapy Ball Small
Jumping Ball Small
Sensi Exercise-Ball Extra Small