Christopher von Rueden of the University of California at Santa Barbara says that the studies are important because they confirm that personality variation has direct fitness consequences.

加州大学圣塔芭芭拉分校的克里斯托弗·冯·罗登肯定了研究的重要性，因为他们证实个性变异对自然选择的结果生殖成就有直接影响**。

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Fitness Expert Chris McCombs is a Personal Trainer in Hollywood California.

瘦身专家克里斯。麦克白是美国加州好莱坞的一个私人教练。

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Italian inventor Lucien Gambarota, who designed California Fitness's method of storing energy and using it to power lights and music in the gym, told CNN the concept is straightforward.

CNN: Are we heading for a human-powered future?

"What we are finding is that when people know that he way that they're exercising here is actually producing electricity and helping the environment, it is one additional motivation for the workout, " says California Fitness President Steve Clinefelter.

CNN: Lucien Gambarota: Alternative energy pioneer

In California, fitness is taken to extremes.

BBC: Living longer better