VOA慢速英语:新锻炼指南：及早开始，少坐

previous – adj. going before in time or order

essentially – adv. in essence : fundamentally —used to identify or stress the basic or essential character or nature of a person or thing or to say that a description is basically true or accurate

vigorous – adj. done with great force and energy

engage – v. to take part in or cause to take part in something

treadmill – n. an exercise machine which has a large belt that moves around while a person walks or runs on it

benefit – n. a good or helpful result or effect

anxiety – n. fear or nervousness about what might happen

recommend – v. to say that (someone or something) is good and deserves to be chosen

brisk – adj. done with quickness and energy

flexibility – n. ability to bend