Kara acts as a support system.
Explanation:
As Kara has started a new exercise program ,her sister helps in evaluating the program in a proper way. Her sister is acting as a support system. Kara's sister is proving feedback regarding her work which will help Kara to remove all the loopholes and will help to develop other techniques that will make the exercise program much more effective. Kara's sister is providing her with emotional as well as practical support.
