The yoga ball, or mini ball, is usually unweighted and used as you've seen Cathe use it. I believe the 6-inch ball you referred to is just a smaller version of the 9-inch. The smaller balls are usually toning balls and are weighted between 1-4 pounds. These are used similarly to light dumbbells and can add arm toning and increase the overall intensity. Exercises are normally high rep with lots of pulses.what is the difference in use of a 4 inch Pilates ball versus a 9 inch ball like Cathe sells (she calls hers a yoga ball)?
I have my stability ball and a 3kg medicine ball. I also have some tennis balls and spiky balls for massaging. I have 2 large storage bins with all my props, including the balls, yoga blocks and straps, Pilates rings, various massagers, resistance bands and tubing, a balance disc and a wobble board. They certainly make my workouts more interesting and fun.Actually I am ball crazy.