Which of the following is a physiological benefit of excercising?
a. better posture
b. decreased risk of anxiety
c. improved sleep quality
d. more confidence

A. better posture: is not a physiological benefit of excercising.

b. decreased risk of anxiety: is a physiological benefit of excercising.

c. improved sleep quality: is a physiological benefit of excercising.

d. more confidence: is a physiological benefit of excercising. 

But, the main physiological benefit of excercising is b. decreased risk of anxiety, because  the neurotransmitters released during and after exercising may help people who suffer from anxiety to subside. 

In order to help the student expand his/her knowledge I will help answer the question. This in hope that the student will get a piece of knowledge that will help him/her through his/her homework or future tests.

The physiological benefits of exercising are the following: improved self-esteem, improved mood, reduced stress and the ability to fight stress. The correct choice is letter  

D. more confidence  

I hope it helps, Regards.      

Expansion of the stomach