Introduction: Regular physical activity (PA) practice represents a key component of obesity treatment. Objective: Based on self-determination theory (SDT), this cross-sectional study aimed to explore the motivational characteristics associated with PA practice among obese adolescents. Method: One hundred and five overweight or obese adolescents (mean age = 15 years old, SD = 2.69) were questioned about their level of PA, motivational regulations toward PA and level of satisfaction of basic psychological needs. Results: Data revealed that satisfaction of autonomy and relatedness needs is positively associated with autonomous forms of motivation (e.g., for integrated regulation β = .44; and 0.35, respectively, p < .01). Otherwise, non-satisfaction of the needs of autonomy and competence is associated with the most controlled forms of motivation (e.g., for external regulation β = −.27, p < .01; and −.18, p < .05, respectively). In turn, a high level of identified regulation, a low level of external regulation and a high level of satisfaction of the need for competence are associated with weekly PA (β = .28; −.19 and .24, respectively, p < .05). Conclusion: SDT appears as an interesting theoretical framework to explore motivational antecedents of PA among obese adolescents.
