Abstract: An exerciser includes a base including a top and a semispherical member including a semispherical periphery having a lower end. The lower end of the semispherical periphery of the semispherical member includes an engaging portion for engaging with the top of the base. The semispherical member further includes a bottom side that does not extend beyond a plane on which the lower end of the semispherical periphery of the semispherical member lies.

Abstract: A massage cushion has a body. A plurality of first protrusions and a plurality of second protrusions are formed on a side of the body. Each first protrusion and each second protrusion are made of the same material. A diameter of a root portion of each first protrusion is greater than that of a root portion of each second protrusion. The first protrusions and the second protrusions are so constructed that the buttocks of a person sitting on the side of the body are in contact with at least one of the first protrusions and at least one of the second protrusions. The first protrusions on the body cover an area that corresponds to an area occupied by buttocks of a person sitting on the side of the body.

Abstract: A massage member comprises an elongated member having an outer periphery and made of soft material. Two groups of protrusions are formed on the outer periphery of the elongated member and spaced apart by a portion of a length of the elongated member. Each group of protrusions includes a plurality of rows of protrusions. Each row of protrusions is annularly arranged on the outer periphery of the elongated member. In each group of protrusions, each of one row of protrusions has a radial length that is shorter than that each of another row of protrusions that is more far away from the portion of the length of the elongated member. The groups of protrusions together define a neck receiving area for receiving and massaging a neck of a body.