Have you ever wished your workout felt more fun, playful, and creative—yet still seriously effective? Enter the  BOSU® Balance Trainer  and the  Small Ball  (aka mini stability ball, Pilates ball, or therapy ball). Individually, they’re fantastic. But when you combine the two? Magic happens. Why the Small Ball is a Big Deal The Small Ball may only be about 9 inches in diameter, but don’t let its size fool you. It’s portable, durable, anti-slip, and burst-proof—perfect for hom