Abstract: The ExerThighzer is an apparatus for securing a dumbbell to a person's leg to enable the wearer to exercise the muscles of the leg by performing various leg exercises. The apparatus has the complete ability to strengthen the entire thigh by allowing a full contraction and extension of the quadriceps and biceps femoris muscles and allows for the abduction and adduction of the thigh muscles. The apparatus is equipped with a cushioned cuff that is strapped around the lower leg and can be used by any individual and is adaptable to varying amounts of weight. The apparatus provides users with alternative forms of exercise utilizing dumbbells that are locked into the housing unit in a way previously unable to be used for such exercises.