Transcript:

6000 Mexicans preparing to dance their way into the record books.
A crowd of mostly women flocked to the capital city's Zocalo Square for the world's largest aerobics class.
Having cemented their place in history, organisers hope the participants will continue an active lifestyle.
Local authorities are looking to get people out of their houses to enjoy the great outdoors in the sprawling metropolis.

Vocabulary:

the record books 正式的官方文件

flocked 成群的，大量的

aerobics 有氧运动

cemented v. 巩固

sprawling metropolis 大都市