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Being pos- itive and enthusiastic is part of a personal trainer's job description. What matters is how that enthusiasm is expressed through a trainer's personality. There's a huge difference between nonstop bubbly and nonstop intensify. You'll be paying this person to spend a lot of time with you, so make sure you have a good rapport. • Communication skills. An effective personal trainer needs superb communication skills. You want a trainer who listens to your concerns and who takes the time to explain things in a way that you can understand. A trainer with a Ph.D. in exercise science is useless if he or she can't commu- nicate knowledge in a way that makes sense to you. There is no such thing as a stupid question. If a trainer makes you feel otherwise, find another trainer. • Gender: Training is an up close and personal activity. You may prefer to work with a trainer of either the same or the opposite sex. • Fees: Expect to pay between $50 and $100 an hour for a personal trainer. Ask about reduced rates for multiple sessions. What is the trainers cancellation policy? How and when are you billed? • Availability: Can the trainer accommodate your schedule? If you're not a morning person, don't expect yourself to get up at 5:30 a.m. to sweat with Sven. The concept of group exercise is not new. Arthur Jones, the inventor of Nautilus fitness equipment, first introduced circuit training or group exer- cise concepts back in the 1970s, and these are now becoming popular once again. Fitness centers have been using the group exercise format for many years under many names (dance aerobics, step classes, cycling programs, etc.). The principle is very simple: Its more fun to work out with your friends or others in a group scenario. Fun and camaraderie are key elements to the success of any group situation. One of the fastest-growing fitness franchises in the world offers a 30- minute circuit training course. All of the equipment is hydraulic, and there are no weights to add or remove. The object is to keep the heart rate going, so half of the time you do aerobics on boards or steps and half the time you use strength-training equipment. This means you can get a complete fat-burning, muscle-toning, cardio- vascular workout in just 30 minutes. The workout is performed in an in- terval circuit format (work) with timed intervals (usually 30 to 45 seconds) at each station. Usually a total of 9 to 13 resis- tance stations is used. These pieces use hydraulic cylinders designed to pro- vide the amount of resistance you require for the type of exercise you desire. Hydraulic resistance is the only type of resistance that is "accommodat- ing" in nature; that is, the resistance matches the effort of the user, even as the user fatigues during exercise. The principle is similar to that of aquatics; the faster one tries to move fluid, the greater the resistance. You're much less susceptible to injury on this type of equipment.