Yes, because I would assume you’re approaching training as a learned, educated craft more than just a hobby you want to make money from. I’m married to a PT and have received immeasurable knowledge that I’ve used to educate myself as well as several friends that have asked for advice. In no way would I officially try to “train” them or suggest that I’m an expert because while I’m no novice to lifting, I know I wouldn’t feel comfortable trusting someone else’s safety and health without evidence that I’ve been educated to do so.
Certification is about safety. It’s about knowing what exercises are contraindicated for certain medical conditions, medicines, and what they do to individuals long-term. Just because someone has done steroids and has a good physique does not mean they know how to train someone with various personal issues.
Here’s a better statement if your Personal Trainer tells you they are a PT question them, PT means physical therapist. It’s actually illegal to say you are a PT if you are just a personal trainer. I work as a PTA, Physical Therapist Assistant. There have been multiple cases of places losing there businesses because of this simple statement.