down by more than a few minutes in the past fifty years?" The devotees of the anti-work movement therefore attempt to find answers and practical solutions towards reducing the volume of work for a typical person and encouraging the activities they see as conducive to happiness. [ citation needed ] Work–life balance is a broad concept including proper prioritizing between "work" ( career and ambition) on one hand and "life" ( health , pleasure , leisure , family and spiritual development ) on the other. Related, though broader, terms include "lifestyle balance" and "life balance". The expression was first used in the late 1970s to describe the balance between an individual's work and personal life. [ 29 ] In the United States , this phrase was first used in 1986. [ citation needed ] The term slacker is commonly used to refer to a person who avoids work (especially British English), or (primarily in North American English) an educated person who is viewed as an underachiever . [ 30 ] [ 31 ] While use of the term slacker dates back to about 1790 or 1898 depending on the source, it gained some recognition during the British Gezira Scheme , when Sudanese labourers protested their relative powerlessness by working lethargically, a form of protest known as 'slacking'. [ 32 ] The term achieved a boost in popularity after its use in the films Back to the Future by Robert Zemeckis , and Richard Linklater 's Slacker . [ 30 ]