Hours of operation: If the gym opens at 8 a.m. and the best time for you to work out is between 6 and 7 a.m., that gym is not the one for you. Some gyms offer 24-hour access, allowing members to come and go as they please. If the gym isn't open when you have time to work out, then it's not worth the cost of the membership.
Trainers: If you are getting started on a fitness program or are interested in training for an event, a personal trainer can offer valuable advice on how to meet your personal goals. Many gyms have trainers on staff or have trainers who are available by appointment. And don't be shy about asking for a trainer's help in performing individual exercises if you're not sure - it's what they're there for.