The answer is c. It is c because after you do strenuous exercise you are in recovery so it is recovery heart rate.
Weight training and isometric exercise
It could be several things
1. IT (iliotibial) band syndrome: Touch tissue that is from your hip to the outer part of your knee. When you over-exercise, it can become inflamed. Causes pain on outer side of knee.
2. Meniscal Tear: When cartilage rips. Pain and swelling are common symptoms.
3. ACL- Anterior Cruciate Ligament. Mostly seen in athletes.
I'm pretty sure her problem is number 3
50% of American adults do not exercise on a regular basis.
