Weights machines are resistance-exercise stations with a fixed action. Most weights machines have one or two uses, but there are others that have a variety of attachments and handles that allow the user to perform a multiple exercises.
As with any piece of equipment, there are pros and cons. Some argue a forced range of movement does not allow proper training of small stabilizing muscles in the joints. Others argue weights machines are safer than free weights and allow the user to control the weight better, providing more resistance.
Examples of weight machines include the pec deck, the seated row and the leg press.