Reviewers say Precor makes the best elliptical trainers on the market. The EFX 5.17i is Precor's entry-level elliptical trainer, but reviews say that doesn't stop it from being one of the most durable options. It has four programs, and there are 20 resistance levels. One feature that sets it apart from cheaper elliptical machines is an incline that adjusts from 12 to 25 degrees.
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