Help you create a workout program if you don't know where to start. Many times people sign up for gym memberships but are overwhelmed by the options available. If you haven't been a regular athlete in the past, then a trainer can help you find a program that works for you. He or she can also teach you the fundamentals of a good exercise program so that you can adjust your workouts over time.
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A trainer CAN'T:
Motivate you. At best, you'll be hiring an extremely expensive babysitter to stand over you and force you to exercise. And don't think that spending the money will get you serious about your workouts. If you didn't have a problem wasting your expensive gym membership, a few more dollars out the window aren't likely to make a difference, either.