A method of performing a fit test on an actuator unit coupled to a user. The method includes actuating the actuator unit; determining a first configuration of the actuator unit generated during the actuating the actuator unit; determining a second configuration of the actuator unit generated during the actuating the actuator unit; determining a change in configuration of the actuator unit based at least in part on the difference between the first and second configuration; and determining that the change in configuration corresponds to an improper fit of the actuator unit to the user.