Well I can speak from experience when I went to my midlife crisis I was basically focusing on my career at which point there was confusing for me it wasn't clear as to what I want to do.
If you will accept two answers, B and C are correct. If not, choose C because this individual is running long distance over and over again they will have an increase in muscular endurance.
Answer:
Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
Explanation:
