A patient two days post arthroscopy of the knee attempts to complete a quadriceps setting exercise while lying supine on a mat table. The patient attempts to perform the exercise twice unsuccessfully and reports that they experienced severe pain. Which of the following actions is the MOST appropriate for the physical therapist to take?

1. Have the patient perform the exercise in sidelying
2. Have the patient flex the knee prior to initiating the exercise
3. Place a pillow under the ankle
4. Discontinue the exercise

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