US Patent 7674185 Training device for swing development

A training device 100 for swing development. A pair of telescoping rods 10 and 12 extend from a spring, one from either end. Each rod is connected to a coupling device 24, 26 having a rotating bearing to which are connected a pair of handles 4, 6. The handles 4, 6 extend perpendicularly to the telescoping rods 10, 12 and in opposite directions to one another. Various attachments can be connected to the handles 4, 6 to be rotated therewith; for example, representations of the sporting equipment to be swung such as a golf club 30 or racquet, or attachments to cause resistance to handle rotation or providing a periodic noise to work on swing rhythm.