When considering a trainer, keep the Four E's in mind:

1. Experience. Find out how long a prospective trainer has been in business, and ask about areas of specialty. If bodybuilding is your goal, choose a trainer with experience in this area. If you are a runner or cyclist looking to improve your speed, try to find a trainer who has coached runners and cyclists.
2. Education. Your trainer should have a current certification from a reputable fitness organization.
3. Emergencies. Ask whether your trainer is up to date on his or her certification in some basic first aid and/or CPR.
4. Explanation. Be prepared to explain your goals to a prospective trainer so he or she can offer guidance and help you track your progress, and be sure that your trainer explains the benefits of your exercise plan and shows you the correct techniques.

A good personal trainer will listen and understand your goals and develop a sensible, realistic training plan. If you feel intimidated or uncomfortable with a trainer, it's not a good match. Trust your instincts and don't hesitate to switch to another trainer if you aren't satisfied. If you have prepaid for a set number of sessions, you may be able to get a partial refund. Some gyms allow you to transfer sessions from one trainer to another within the same gym. Policies vary, but you won't know unless you ask.