Abstract: A dumbbell provided with a weight at both end portions thereof. The weight is detachable from the dumbbell so as to make it adjustable in weight in accordance to the weight dealing capacity of a trainee. This dumbbell is also equipped with a grip promoting member at the grasping portion thereof also detachably therefrom, thus this invention is meaningful from the view point of economy and efficiency in training. The dumbbell has a handle and a threaded bar at each end thereof to receive threaded weights. Each unit of weights at each end of the bar is spherically shaped. Each unit of weight is composed of a plurality of parallel sections passing through the sphere. The axis of each sphere coincides with the longitudinal axis of the handle. The weights of each unit are in abutting relationship. The grip includes a spring and is mounted in a cantilevered manner to the handle. One end of the spring is detachably anchored in a reduced section of the handle at a position toward one end of the handle.