Fifty Shades of Grey, published in 2011, is the first book in British author E. L. James's best-selling erotic romance series about the relationship between college graduate Anastasia Steele and wealthy businessman Christian Grey. The story involves a contract with rules for Ana, including regular workouts, maintaining her health, and obeying Christian's requests. The contract is negotiable, and Ana changes the number of required workouts from four to three times a week.