六级练习2014.12.02 because, harder, Michael, provides, health

Rebecca949

Not only does this help the health club save money, it also provides added incentive for the exercisers to work harder.
"I like that since the minute I'm coming to the gym to work out. Anyway, it's good that, you know, I get a work-out while also _________________________________that the gym has to use."
Michael Pranikof has tried the bike twice so far. "I really like it. This is, it's really cool because you know that _________________________________ and you are actually giving power, giving some power back." The Green Revolution's first installation was a year and a half ago.  Now, they have installations in about 60 facilities across the United States and Canada. The company says it is testing ways to apply the technology to other kinds of cardio-fitness devices, _________________________________.

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laura6688

producing energy and coming back to power
contributing eneronment
such as rolling machines and to the book trainers

herman_liu76

helping produce energy and counting back on the power.
you are contributing ?? enviroment
such as rolling machines and ?? of goal trainers.

susan.sui

helping produce energy and cutting back on the power
you're contributing to keep environment
such as rolling machines and electable trainers