Go to several clubs. Take your time. Ask questions. Get recommendations from friends. But don't make a decision until you've looked at all of your options.
Atmosphere
Although you don't need to become best buddies with your fellow exercisers, it's important that you feel at ease with the gym environment and its clientele. Perhaps loud techno music and hordes of bespandexed aerobics bunnies aren't your cup of tea. Find a club that matches your personality and comfort level. Feeling like the odd one out every time you hit the gym won't help you get there on a tough day.
Fitness equipment
Many gyms offer all kinds of state-of-the-art equipment to woo you through the door. Great machines can certainly help you achieve your fitness goals, but try to look past all the flash and sparkle. At the end of the day, even simple equipment such as a barbell and bench can offer fitness and health benefits if properly used.
Trainers
If you decide to hire a trainer, look for these things: a bachelor's degree in exercise science or a related health-science discipline, experience, and, minimally, a certification from an internationally recognized organization like the American College of Sports Medicine, National Strength and Conditioning Association, or the American Council on Exercise.
Cleanliness
No, sweaty machines are not a given. And even if it doesn't gross you out, bear in mind that filthy equipment can carry contagious skin fungi. Ask about the club's cleaning regimen, and always remember to protect yourself by wearing a shirt and carrying a towel.
To Be Continued....