Abstract: A method for making a ball includes the steps of preparing a mold composed of a lower mold and an upper mold detachably connected to the lower mold, wherein the lower mold and the upper mold have multiple suction holes, filling the lower mold and the upper mold with covering pieces, filling the lower mold and the upper mold with strips, placing a bladder in the lower mold and on top of the covering pieces and strips in the lower mold, mating the upper mold with the lower mold, securing the covering pieces on the bladder, and removing finished product from the mold.

Abstract: An exercise ball has a bladder, a yarn lining wound on an outer face of the bladder, an air layer formed between the outer face of the bladder and the yarn lining, a cloth lining wrapped on the yarn lining, an adhesive layer applied on an outer surface of the cloth lining, a sponge lining securely attached to the cloth lining by the adhesive layer, and an outer surface securely engaged with the sponge lining. With the provision of the air lining and the sponge lining, the exercise ball is able to maintain its softness.

Abstract: An exercise ball has a bladder, a yarn lining wound on an outer face of the bladder, an air layer formed between the outer face of the bladder and the yarn lining, a cloth lining wrapped on the yarn lining, an adhesive layer applied on an outer surface of the cloth lining, a sponge lining securely attached to the cloth lining by the adhesive layer, and an outer surface securely engaged with the sponge lining. With the provision of the air lining and the sponge lining, the exercise ball is able to maintain its softness.