Do I need a personal trainer, or can I just follow a program?
This is the question I would ask if I were on the other side of it. Coaching costs real money. A written program costs less than a single class. If the program is good, what exactly is the extra money buying?
I want to answer it with what the research actually found rather than what would be convenient for me to tell you, so some of this argues against hiring me.
What the studies found
The best summary is a systematic review and meta-analysis by Fisher and colleagues, published in 2022, which pooled twelve studies comparing supervised resistance training against unsupervised training — 301 people training with supervision and 276 training on their own.
Two findings, and they point in different directions.
On strength, supervision won. The pooled effect was 0.40, which in this field is a real but moderate difference — not nothing, not transformative. The people being supervised got stronger faster than the people training alone from the same programs.
On body composition, supervision did essentially nothing. The effect there was 0.07, which the authors themselves describe as trivial, with a confidence interval that crosses zero. Supervised and unsupervised groups changed about the same amount.
The authors' own conclusion is worth quoting closely: supervised training might produce a small effect on performance, most likely in strength, but has little impact on body composition outcomes.
A smaller study since then found something similar with more texture. Over eight weeks with thirty-six people who already lifted, the supervised group gained more in squat strength and in measured thickness of the quadriceps and triceps — but on the bench press there was no meaningful difference at all.
So what is supervision actually doing?
Look at where the effect showed up and where it vanished, and the mechanism becomes fairly obvious.
It showed up in the squat. It disappeared in the bench press. The squat is the lift where technique is hardest, where the weight is heaviest, and — this is the important part — where people are most likely to quietly stop a few reps short because the last ones are genuinely unpleasant.
Supervision is not transferring some secret into you. It is mostly changing two things: how heavy you are willing to go and how close to your actual limit you are willing to work. Left alone, nearly everyone picks a weight they know they can handle and stops while it still feels manageable. That is not a character flaw, it is what people do. Having someone there who says "that was three reps short, add ten pounds" is a large part of what you are paying for.
The rest is technique on the lifts where technique is hard, and not wasting months on a program that was never built for what you want.
The thing the studies cannot measure
Every study above compares people who completed the study. They are measuring outcomes among people who kept training for eight or twelve weeks because they had enrolled in something.
That leaves out the failure mode that actually ends most training: not doing it. Not doing it badly — not doing it at all. A perfect program you abandon in week three produces nothing, and no meta-analysis will ever capture how often that happens, because those people are not in the data.
I am not going to claim a number for this, because I do not have one and neither does anyone else selling you coaching. But it is the honest reason the research understates the gap for some people and overstates it for others.
Which one are you?
Here is the question I would actually ask, and it is not about your budget.
Is your bottleneck knowing what to do, or doing it?
If you already lift, you know how a squat and a hinge and a press feel when they are right, you will genuinely train on a Tuesday when nothing is stopping you except that you do not feel like it, and what you are missing is a sensible plan — then a written program is enough. That is not me being modest. The research says the body composition difference is trivial, and the strength difference is something you can partly close by being honest with yourself about how heavy you are going. Mine run from $14.99 to $39 and I would rather sell you one of those than coaching you do not need.
If you are new to lifting, or you are working around an injury, or your numbers have not moved in months, or you know perfectly well that you will not push a hard set alone — then that is exactly the gap supervision fills, and paying for it is a reasonable thing to do. Coaching starts from $229 a month, and if you are in Scottsdale the first session is free.
There is a middle option that gets overlooked. Online coaching gets you the programming written for you, and your technique reviewed from video, without paying for someone to stand next to you. It is the cheapest of the coaching options and it suits people who train fine on their own but keep guessing at the plan.
What I would tell you to do
Come to a first session and find out which one you are, before you spend anything. It is free, there is no card and nothing to sign, and by the end of it I will have watched you lift.
If I think a written program is all you need, I will say so and point you at the right one. That is a worse outcome for me and the right one for you, and I would rather have you as someone who trusts what I say than as one month of coaching you did not need.