Mini balls are similar to large exercise balls in that they add leverage and instability challenges to exercises. (verywellfit.com)
You can use larger exercise balls or roller toys, like the Infantino roller pictured, to position your baby. (verywellfamily.com)
Hence Dogwood's full roster of spring, fall, and even winter camp activities, including lure coursing, skijoring, treibball (a sport in which dogs must gather and drive large exercise balls into a soccer goal), and «doga» (dog - friendly hatha yoga). (thenoseprint.com)