JW Marriott Las Vegas Resort Spa And Golf  

Summerlin, Nevada, United States

The only catch: This great gym is attached to the hotel's spa, so guests need to either shell out $25 to use it, or splurge on a spa treatment to access it. For guests who don't want to pay, the hotel also has a smaller, 24-hour complimentary gym, but it's essentially just fitness equipment in a hotel suite.

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