Abstract: A dual sided closure comprising a divider wall at its interior midsection, in combination with at least one substantially cylindrical container comprising a substantially centered and substantially cylindrical neck portion with said neck portion further comprising an external surface diameter substantially identical to the external surface diameter of the dual sided closure, whereby the attachment of a second and substantially identical container will assemble to resemble, and function as, a fillable dumbbell exercise device.

Abstract: A device and method of exercise for exercising the hamstring/gluteal muscles comprising the steps of; providing a weighted means, attaching said weighted means approximate the knee with a fastening means, and performing leg lifts. More specifically, weighted means comprise a standard dumbbell. Fastening means is comprised of a strap comprised of hook and loop material. That location described as approximate the knee, is more specifically defined as the hollow of the knee. Leg lifts comprise that exercise commonly referred to as donkey kicks from a position of being on ones hands and knees. This device and method of exercise of the present invention incorporates that position of the users body that fully engages the hamstring/gluteal muscles prior to initiating, and during the prescribed exercises, thereby allowing full benefit to be attained from the weighted tension directed to them.