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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
