Costly Memberships
There are plenty of great reasons to sign up for a monthy or yearly gym membership — starting with: you actually go enough times each week to make it a worthwhile investment. Many gyms offer specials throughout the year where they waive first-time membership fees or offer deals on monthly costs. If you're new to the gym, it's wise to wait until you get the lay of the land before officially joining and committing to a costly membership. Take classes or pay for day passes to determine if you really are using the gym's services often enough to warrant a membership. And don't be afraid to ask around (or just ask the front desk) about upcoming promotions that can help lower the costs.
Certified Trainers
This post is not intended to knock certified trainers, many of whom are gurus when it comes to fitness and nutrition. A great trainer can help you tone your body and build endurance in ways you never dreamt possible — and they'll push you to excel at times when you might otherwise throw in the towel.
With that said, not all trainers are equal, despite how a gym attempts to sell their credentials. One "certified" trainer doesn't necessarily have the same qualifications as another "certified" trainer. If paying for private sessions is important for you, ask about their experience so that you can make a more informed decision.
Protein Shakes And Supplements
If your training session ends with the suggestion that you stock up on a certain brand of protein shake or supplements sold at the gym (of course), run, don't walk, in the opposite direction.
It's one thing to be given helpful advice about fitness aids that can improve your game. It's another thing to have products pushed on you at all times — especially when it's possible you can score the same exact powder or pill for less elsewhere. Don't give in and buy these products without doing a little research first (remember: Amazon is your best friend).