Taking a nutritional supplement during times of stress
a. can you feel better because you believe it will you.
b. only adds to the stress you're feeling.
c. has been scientifically proven to aid in stress management.
d. is recommended by all doctors as a stress-management technique.

A is the answer can help you feel better because you believe it can help you

these are common warning signs of overtraining syndrome:

washed-out feeling, tired, drained, lack of energy

mild leg soreness, general aches, and pains

pain in muscles and joints

sudden drop in performance

insomnia

headaches

decreased immunity (increased number of colds, and sore throats)

decrease in training capacity/intensity

moodiness and irritability

depression

loss of enthusiasm for the sport

decreased appetite

increased incidence of injuries.

a compulsive need to exercise