Great Hotel Gyms

Sticking to your regular workouts isn't easy when you're on the road. If you can book a hotel with a fitness center, your battle's halfway won. Here are four great hotel gyms you'll love on your next trip:

Aria Resort & Casino
Las Vegas, Nev.

Working up a sweat might not top the to-do lists of most Sin City visitors, but the Aria makes it easy -- and enjoyable -- to knock out a good workout. Aria's fitness center features dozens of high-end cardio machines and strength equipment. For a bonus, sign up for one of its innovative fitness classes like kettlebell training or the indoor hike where a trainer leads you on a hike through the massive complex, stopping at various places to do step-ups (like in the lobby!), tricep dips or sit-ups.

Elysian Hotel
Chicago, Ill.

The Elysian boasts one of the classiest hotel gyms I've seen. Not only does it have a full line of cardio and weight machines, but it also has a Pilates and Gyrotonics studios. Private and semiprivate instruction is available. There are also a handful of fitness classes and personal training sessions where the trainer takes you outside for a workout. And there is a lap pool with colorful mosaic tiles where you can do laps or take an aquatics class.

Ritz-Carlton Key Biscayne
Key Biscayne, Fla.

You'll find high-end cardio and strength equipment, but the real draw is the class roster. Standards like spinning and Iyengar yoga appear on the menu, as do specialty classes. For instance, try Poolates, which is Pilates in the pool. Don't let it fool you: It's tougher than it looks. Pilate moves that I'd mastered on land became difficult in the water. Or try the Atlantic Walk, during which your instructor will take you for a walk on the beach and teach you how to walk tall, using Pilates principles. For something more intense, hit Water Works for a high-energy pool workout.

The Fairmont San Francisco Hotel
San Francisco, Calif.

This is your typical fitness center with all of the bells and whistles you'll need to get in a good sweat. The club is actually a Club One Fitness Center for San Fran residents that Fairmont guests can use. Here's the cool part, though: If you sign up for the Fairmont's President's Club, which is free, you get complimentary access to the fitness center and classes, which include aerobics, Pilates, yoga and spinning.