15. if a client's knees hurt after a one-week walking regimen, which one of the following suggestions is most appropriate?
a. switch to anaerobic exercise.
b. wear different shoes.
c. jog in a swimming pool.
d. take a week's rest from exercise.

How does drinking alcohol or using drugs put a person at risk for hiv infection? a. they improve judgment, which makes it more likely for people to engage in risky behavior. b. they impair judgment, which makes it more likely for people to engage in risky behavior. c. they impair judgment, which makes it less likely for people to engage in risky behavior. d. they improve judgment, which makes it less likely for people to engage in risky behavior.