Includes variations using barbell, dumbbell and resistance band, etc. Another example is the dumbbell curl at the elbow. They lengthen during the dumbbell lifting phase and shorten during the dumbbell lowering phase. The Shake Weight is a modified dumbbell that oscillates, purportedly increasing the effects of exercise. Incognito allegedly threw a tennis ball and a dumbbell at another gym patron. The dumbbell weight was for the men for the women. A simple example of this principle is a spinning dumbbell. Some star projectors have two balls at opposite ends of the projector like a dumbbell. They exhibit a variety of shapes ranging from spherical to dumbbell, disc, oval, and teardrop. Only four men took part in the Dumbbell Press, and Belsak attacked that one. The Dumbbell Press was the penultimate event. The next shape is denoted by the letter and has the form of a dumbbell. These molecular machines are usually based on the movement of the macrocycle on the dumbbell. One particular dumbbell of Cyr's weighed, when empty, .