Certifications of personal trainers are mostly arbitrary, like a college degree is to a Starbucks barista. Just because you have a fancy piece of paper, it doesn't automatically make you special. Heck, I just saw an ad for this certification that can be done completely online.
However, real certifications, especially anything geared toward strength or conditioning or athletic performance, such as the CSCS certification, are very good. There are several good undergraduate degrees that can get people started in the right direction as well.
I should know because I've had a personal trainer in the past; turns out that he didn't really know what he was doing. He was a good guy and all, fun to be around while working out, but didn't exactly get the job done after the first couple of months. And it wasn't just him. I know people who have employed the help of trainers and gotten much less than their money's worth. And I see trainers having their clients do the stupidest stuff sometimes.
LOL.
Now, that's not to give trainers a bad rap. There are plenty of good ones out there, and even the mediocre ones can be worth it in the short term. My trainer put a good bit of muscle on me in the first couple of months, simply because I started lifting weights on a regular basis and ate a lot more protein. It worked for a while, until my body adapted. I ended up on a plateau that lasted for the last several months I was with him. Sure, it was hard work all the way through, but you have to train smart, and not just hard, if you want continued progress.
Then I went to college and trained the same way I was taught, because that was all I knew. I also decided that I plateaued earlier because I wasn't eating enough, so I fixed that.
It didn't work.
The next semester, I stopped kidding myself. It was obvious that what I did in the Fall was a complete failure. I was not happy with the way I looked. I needed to do something new.
So I did P90X. And I got some pretty decent results. And I realized that I had wasted so much time and effort in the months before.
But that was OK, because I was finally moving forward again.
And that was the beginning of what led me to learn a lot of things through research and real-life experience, and eventually start this blog.
Currently, I'm halfway training, halfway working out with a friend of mine. I am sure I will get some good results out of him because, unlike most personal trainers, I am continually learning more and more about fitness and nutrition, and a lot of times the hard way. Plus it makes going to the gym more enjoyable for both of us.
In the end, most trainers that are subpar tend to overcomplicate things. As a rule of thumb, if a trainer has clients use the swiss ball a lot, he or she doesn't know what the hell they are doing.
This is retarded.
Keep It Simple, Stupid.