Unless some kind of Matrix or Wall-E-level apocalypse happens and humanity lives in comfortable beds being fed pepperoni pizza through food tubes, people will need to stay in shape. Many businesses have begun taking their employees' health seriously, so more workers will have access to both health care for fitness and instructors leading group classes at work. 

The massive baby boomer generation is retiring, and as they enter their senior years they'll do everything they can to remain young (like they always have). All of these conditions lead experts to project a 13% increase in available jobs in the near future (source). And hey, Richard Simmons has had a forty-plus-year career; why shouldn't you?

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