A disadvantage of limitation of correlational research is that: it does not use variables
it uses experimental and control groups
too much math is involved
it does not show cause and effect
it requires the manipulation of the independent variable, random assignment, and control

answer; i believe the answer is (false); ///good luck

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