Reformer Pilates uses a large piece of exercise equipment, called a reformer, that looks similar to a padded table or platform with springs, ropes, pulleys and a sliding carriage.
The key behind the effectiveness of a reformer is resistance, with springs attached to a moving platform on wheels.
The springs allow for changes in resistance, and by pushing or pulling with your arms or legs you can then initiate movement of the carriage along the frame to get a full-body, strength-building workout.