briefly describe the functions of the major human body systems skeletal system nervous system immune system cardiovascular system urinary system endocrine system digestive system respiratory system reproductive system muscular system and skin system

answer: because barriers look like ball

explanation: there round and blue like my ball

i think it is pressuring someone to have sex

hope this : )

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