RESUMEN
Exposure to "fitspiration" may promote exercising for maladaptive weight and appearance reasons in young women. Fitness content depicting higher-weight bodies could promote exercise for adaptive non-appearance motives, and body compassion might protect against the negative effects of "fitspiration" exposure. Two pre-registered experimental studies examined (i) the effects of exposure to fit-normative vs. weight-inclusive Instagram images on young women's exercise intentions and motivations, and (ii) tested trait body compassion as a moderator of the relationships between image exposure and psychosocial exercise outcomes. Using an online experimental paradigm, young adult women were randomized to view Instagram images representing fit-normative, weight-inclusive, or control conditions and completed state measures of exercise intention and motivation. Study 1 (n = 228) employed a post-test design and found no significant effects of condition on exercise outcomes, nor an effect of body compassion. Using a pre- and post-experimental design in Study 2 (n = 797), participants in the weight-inclusive condition exhibited significantly greater increases in exercise intention and fitness/health motivation, while those in the fit-normative condition exhibited greater increases in weight/appearance motivation, compared to controls. Body compassion was not a significant moderator of the associations between exposure to weight-inclusive vs. fit-normative images and exercise outcomes. Exposure to fit-normative Instagram content may encourage dysfunctional exercise motives in young women. Weight-inclusive imagery may more effectively inspire adaptive exercise intentions and motivations, and future research should investigate how it may be leveraged to improve psychosocial exercise outcomes.