慢速英语:研究：抗阻运动对超重老年人骨骼的保护作用

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fracture – n. medical the result of breaking something

randomly - adv. chosen or done without a set plan

aerobic – adj. relating to or requiring free oxygen

workout – n. a period of physical exercise or training

stationary – adj. not designed to move

calorie – n. the energy needed to raise the temperature of one gram of water through 1 degree Celsius

flexibility – n. willingness to change or bend

conclude – v. to finish; to bring something to an end