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Although physical activity interventions are efficacious for decreasing depressive symptomatology severity, there are several barriers to accessing treatment, supporting the need for intervention delivery in more accessible and cost-effective modes. However, individuals may respond defensively to health messages if perceiving them as threatening, and thereby fail to change behaviors. Although online, health-based interventions are effective in leading to behavior change, limited research has been conducted to identify ways in which people respond differently to online health messages. Therefore, the aim of this study was to investigate how individuals differ in their acceptance and interpretation of online health-related messages as threatening, as well as their desire to improve health behaviors based on their current depressive and physical activity levels. A total of 197 participants (MAGE = 36.17 years, SDAGE = 12.52 years) drawn from Amazon Mechanical Turk (MTurk) were asked to read a message regarding the importance of physical activity for health. Their defensiveness and behavior change intentionality were evaluated in relation to physical activity and depressive symptomatology. Individuals who engaged in less physical activity were more accepting of the health message, more likely to find the article threatening, agree that less exercise was related to negative health issues, and agree they should increase their physical activity. Individuals with higher self-ratings of depressive symptomatology were less accepting of the health message, found the article more threatening, and believed it to be less important to increase their physical activity levels. However, neither physical activity nor depression symptom severity were related to whether an individual would actually increase their physical activity. There was no statistically significant correlation between physical activity and depression. Explanations for these findings are provided.