People with spinal cord injury have limited ability to move during rowing exercise. Although electrostimulation can provide some support in this process, it does not accomplish full range of motion. Hence, a rowing movement assistance system for people with spinal cord injury t7 has been designed, which consists of an ergonomic chair that adjusts to the user's needs and a displacement mechanism that optimizes movement efficiency. During the design process, the maximum loads that the chair will support have been evaluated in order to guarantee its resistance and durability. In addition, a mathematical model based on literature has been developed to evaluate the capabilities of the motor to be used. Finally, it is obtained that the design can be implemented in the Concept2 machine, complying with the established design parameters.