The 20-item Fit Ideal Internalization Test (FIIT; Uhlmann et al., 2020) assesses girls’ and women’s thoughts, feelings, and behaviors that represent manifestations of three interrelated fit ideal internalization domains: personal idealization of the fit ideal, overvaluing of the fit ideal, and striving for a lean and toned female body shape. The FIIT operationalizes the fit ideal as a distinct set of ideals, values, and desires that differ from those associated with either the thin body ideal or the muscular body ideal. The FIIT can be administered online or in-person to female-identifying adolescent and adults and is free to use. This chapter first discusses the development of the FIIT and then provides evidence of its psychometrics. More specifically, the FIIT has a 3-factor structure within exploratory and confirmatory factor analyses: Fit Idealization (8 items), Fit Overvaluation (8 items), and Fit Behavioral Drive (4 items). Evidence has been found for a higher-order factor. Internal consistency reliability, test-retest reliability, convergent validity, discriminant validity, and incremental validity support the use of the FIIT. Next, this chapter provides the FIIT items in their entirety, instructions for administration and scoring, and the item response scale. Logistics of use, such as permissions, copyright, and contact information, are available for readers.

The 6-item Drive for Leanness Scale (DLS; Smolak & Murnen, 2008) was designed to measure concerns about leanness than anyone, regardless of gender, might share. Thus, the drive for leanness construct was derived to be distinct from concerns for thinness more common among women, and concerns about muscularity more common among men. The DLS can be administered online or in-person and is free to use. This chapter first discusses the development of the DLS and then provides evidence of its psychometrics. More specifically, the DLS has a unidimensional factor structure within exploratory and confirmatory factor analyses. Internal consistency reliability and construct validity support the use of the DLS with women and men. Gender differences are minimal. Next, this chapter provides the DLS items in their entirety, instructions for administration and scoring, and the item response scale. Logistics of use, such as permissions, copyright, and contact information, are available for readers.