If your knees hurt after a one-week walking regimen, which one of the following workout changes would be most appropriate?

a. jog in a swimming pool.
b. switch to anaerobic exercise.
c. take a week's rest from exercise.
d. wear different shoes.

Answer in a couple of paragraphs, 1 or 2 at the most if anything! 20 points + brainliest--> explain what all the systems in your body do to work together < --list of systems needed: circulatory systemrespiratory systemdigestive systemexcretory systemnervous system