the.com/reformer

means A person who works to change a system, institution, or practice for the better — or, in gym contexts, the sliding-bed exercise machine with springs and straps that this entry is actually mocking.

from From 'reform,' built on Latin reformare — re- ('again') plus formare ('to shape'), so literally 'to shape again.' The human sense (one who pushes for moral, political, or social change) is the older, sturdier meaning, dating back centuries. The Pilates machine borrowed the word in the 20th century — inventor Joseph Pilates designed it to 're-form' the body's posture and strength, springs standing in for the zeal of a social crusader.