Write the next sentence in the following story.

How to do leg workout rehabilitation for knee pain
Give your body a chance to heal.
For a minor injury, take a few days of rest from your activities. Maybe, that's all you need.

Possible answers:
(1). But regular rest does more harm than good. Lean over a gym sofa and watch the world go by.;
(2). A severe injury needs more recovery time, and it may require surgery and physical therapy. In this case, you have to check with a physician first, and rest the joint until advised.;
(3). But if you put in 30 minutes, you can begin healing! As mentioned earlier, you need to exercise regularly for 5 to 10 days after a knee injury. Even if you talk to your doctor at the outset, doing several days a week will help repair your knee in ways that only surgery can do.;
(4). Well, time to test your strength and balance again. For a larger injury, focus on standing leg workouts or mountain climbers with good technique and stamina.;. The answer should be
(2).