Endorphins reducing stress levels
School attendance is required throughout the states.
Health education builds students' knowledge, skills and positive attitudes about health. Health education teaches about physical, mental, emotional and social health. It motivates students to improve and maintain their health, prevent disease and reduce risky behaviors.
Magnetic resolution imaging (MRI) and ultrasound.
What doesn't limit the range of moton from the things which you've mentioned would be age. Age per se doesn't really limit the range of motion - while there are factors which negatively influence our range of motion and which are strongly correlated with age, it is hard to say that age itself would be the cause of a limited range of motion.