The Reformer is the premier piece of Pilates equipment. It is a half bed like frame with a carriage on it, which rolls forward and backwards on wheels within the frame. The carriage is attached to one end of the reformer by springs which can be adjusted to different levels of resistance. There are shoulder rests at one end which stop you from sliding off as you move.
The Reformer is very versatile. Exercises can be done laying down, sitting, standing, pulling the straps, pushing against the footbar, with additional equipment, upside-down, sideways and the list goes on.
Exercises done on the Reformer increase core and functional strength, increase muscular endurance, improve posture and alignment, develop long lean muscles, reduce body fat, rehabilitate and prevent injuries.