<qa>  What is the goal of the self-determination theory?Pilot randomized controlled trial evaluating a Self-Determination Theory SDT video-based tele-rehabilitation physical activity intervention aimed to enhance basic psychological needs, motivation, physical activity PA, and quality of life- related outcomes of adults with spinal cord injury SCI. It is anticipated that the individuals who receive the physical activity intervention intervention group will have moderate increases in their basic psychological needs, autonomous motivation, life satisfaction, and physical activity participation, and a moderate decrease in controlled motivation and depressive symptoms compared to the individuals who did not receive the intervention control group. 