You are preparing a home exercise program for a patient recovering from a lumbar posterior lateral disc protrusion progressing through the McKenzie program. Since the patient can perform prone extension with straight arms, which of the following activities would you add to the home program based on the McKenzie progression?
1. Extension exercises and standing
2. Single knee to chest
3. Prone on elbows
4. Double knees to chest
The solution will be posted in a few days