“Blind belief in authority is the greatest enemy of truth.” — Albert Einstein.

I think this quote captures one of the biggest problems we face when making health and fitness decisions.

We are constantly told what we should do. What exercises are best. What movements are bad. What posture is ideal. How we should breathe. How we should eat. How often we should train. And because that information often comes from someone we consider an authority—whether that is a doctor, physical therapist, trainer, researcher, or someone with a large following—we assume it must be true.

But authority and truth aren’t necessarily the same.

That doesn’t mean you should ignore expertise. It means expertise shouldn’t replace critical thinking, observation, and perhaps most importantly, paying attention to how your own body responds.

Nothing Works Forever

Let me be clear: no exercise, workout plan, or diet is perfect.

What makes a particular exercise, training program, or way of eating work for you depends on you at that moment.

And that last part is important.

What works for you today may not work next week, next month, or next year. Your body is constantly changing. Your training history changes. Your stress changes. Your sleep changes. Your environment changes. Your goals change—your ability to recover changes.

Nothing stays the same, so we shouldn’t expect the same approach to work forever.

The problem starts when we attach ourselves to a method simply because it worked before—or because someone we trust told us it was the “right” way to do things.

Instead of asking, “Is this the best exercise?” a better question might be:

“Is this the right exercise for me, right now?”

The Same Person Can Be Different From Week to Week

I’ve been lucky enough to train many different clients over my twenty-plus-year career, and one thing that used to boggle my mind was how differently the same person could respond to the same workout from one week to the next.

One week, I thought I had created the greatest workout ever. Everything clicked. The client moved well, felt great, and responded exactly how I hoped.

The next week, that same workout looked like it belonged in the garbage.

As a younger coach, I was frustrated. I wanted to understand what I had done wrong. If the workout worked so well last week, why wasn’t it working now?

As I got older and gained more experience, I realized something important:

You never really know everything that is going on in someone’s life.

Maybe they didn’t sleep well. Maybe work has been stressful. Maybe they haven’t eaten enough. Maybe they trained hard the day before. Maybe they’re dealing with something emotionally. Or maybe their body simply isn’t responding the same way it did a week ago.

The workout didn’t necessarily change.

The person did.

Stress Changes the Equation

Most of us already know the basics. We need to exercise regularly, eat well, get enough sleep, and manage our stress. If we could consistently do all of those things, we would probably accomplish many of our health and fitness goals.

Unfortunately, knowing what to do and actually doing it are two very different things.

Of all these variables, stress is the one I see creating the biggest challenge for my clients.

STRESS CHANGES EVERYTHING.

You can have the perfect workout written down. You can dial in your nutrition. You can have a plan that worked incredibly well just a few weeks ago. But add enough stress to someone’s life, and their response to that same plan can look completely different.

Stress can affect sleep, recovery, appetite, energy, motivation, pain, and how someone responds to exercise. And when those things begin to change, momentum can disappear quickly.

This is why simply telling someone to exercise harder, eat better, or be more disciplined often misses the bigger picture.

Sometimes the program isn’t the problem.

Sometimes life has changed, and the program needs to change with it.

The Quick-Fix Problem

Most people look for a quick fix these days, and so-called experts have learned to exploit it.

Spend a few minutes online, and you’ll find someone claiming to have the best diet, exercises, or supplements for whatever goal or ailment you might have.

My personal favorite these days, since I’m a guy in my forties, is:

“The best exercises for men over 40.”

How the hell would that person know?

He knows nothing about me. He has never worked with me. He doesn’t know my health or injury history, how I move, my goals, what I enjoy doing, how I sleep, how much stress I’m under, or how I respond to different types of training.

All he knows is my age and gender.

Yet somehow, that is supposed to be enough information to tell me which exercises are best for me?

If you take the time to really analyze this approach, it’s ridiculous. But many people fall for it because certainty is appealing.

We want someone to give us the answer.

Do this exercise.

Follow this diet.

Take this supplement.

Avoid this food.

Never do this movement.

Always do that one.

It removes the uncertainty and makes health and fitness seem much simpler than they really are.

The problem is that simple answers are easy to sell, while individualized answers require time, context, and experimentation.

There is nothing wrong with learning from experts. I do it all the time. The mistake is assuming that because someone is knowledgeable, their recommendation to thousands—or millions—of people automatically applies to you.

It might.

It might not.

You have to find out.

Conclusion

Nobody has all the answers.

We all adapt at different rates to different stimuli. The only thing I can guarantee is that things will change and nothing works forever.

The best professionals understand this. They adapt to the person standing in front of them at that moment. They don’t have a rigid set of non-negotiables that every client or patient must do during every session. They assess, observe, listen, and adjust.

They also recognize when they are no longer the best person to help someone and when it is time to refer out.

Not every physical therapy client should train with a trainer, and not every training client needs physical therapy. There is a time and place for everything. The key is knowing when, where, and how to make changes when needed.

Progress is not linear.

There will be good days and bad days. There will be periods of rapid progress followed by plateaus. There will be stumbling blocks that force you to reevaluate what you are doing. What worked six months ago may not work today.

That isn’t failure. It is part of the process.

Your training, nutrition, recovery, and even the professionals you work with may need to change as you change.

That brings us back to the quote that started this article:

“Blind belief in authority is the greatest enemy of truth.”

Learn from people. Seek out knowledgeable professionals. Listen to their advice. But never stop paying attention to your own experience and asking questions.

And the next time you run into a professional who tells you “this is the only way to do it” or “you should always do it this way”—

please run.

Key Takeaway

There is no perfect exercise, diet, training program, or health strategy that works for everyone—or even for the same person forever.

Your needs change as your body, lifestyle, stress, goals, and circumstances change. Good professionals recognize this and adapt their approach to the person in front of them rather than forcing everyone into the same system.

Learn from experts, but don’t blindly follow anyone. Pay attention to your own results, ask questions, and be willing to change course when something stops working.

Nothing works forever—and that’s exactly why the ability to adapt matters.

Continue Learning

If the Results Don’t Last, You Haven’t Found the Root Cause
Why temporary improvement may be a sign that you still haven’t addressed what is actually driving the problem.

What Does a Movement Assessment Tell You? More Than You Think
Why assessing the individual can provide more useful information than simply applying the same exercises to everyone.

How Stress Changes the Way You Move
See how stress, recovery, sleep, nutrition, and everyday life can change the way your body responds to training.