Notes from Dr. Karen

Shoulder pain is one of the most common things I see in the clinic. And most of the time, the shoulder itself isn’t really where the story starts.

Why the shoulder is so vulnerable

The shoulder is one of the most mobile joints in the body, it moves in almost every direction. That range of motion is what makes it so useful. It’s also what makes it the first place to feel it when something in the surrounding system isn’t holding up its end of the bargain.

The joint itself is relatively shallow. It relies on the muscles, tendons, and mechanics around it to stay centered and absorb load properly. When those things are working well, the shoulder handles a lot. When they’re not, it takes the hit.

What people usually notice, and what’s often behind it

If your shoulder has been bothering you, any of these might feel familiar:

• Poor posture, rounded shoulders and a forward head that’s been the default for years
• A stiff mid-back, when that area stops moving well, the shoulder compensates every time you reach or lift
• That ache across the top of the shoulder and into the neck, often because the small stabilizing muscles have fatigued and the surrounding muscles are picking up the slack

None of these originate at the shoulder. But they all show up there.

Why it keeps coming back

If you treat the pain at the shoulder without addressing what’s driving it, the relief is often temporary. Things calm down, movement feels better, and then the same patterns gradually reload the joint. This is why so many people describe the same shoulder issue returning again and again, or improving and then plateauing without ever fully resolving.

The problem wasn’t fully resolved. It was managed. There’s a difference.

Getting to the root of it means looking beyond the shoulder, at posture, at how the mid-back and neck are moving, and at whether the stabilizing muscles have the endurance to support the joint over time. Addressing these pieces is what gives the shoulder the best opportunity to fully resolve, and stay that way.

Most people don’t go back to their routine because they’re impatient or careless. They go back because they feel better. It seems logical. The pain has eased, movement feels more comfortable, and the routine they know is right there waiting. So they return. Sometimes symptoms come back right away. Sometimes things feel fine for a while before symptoms return. Either way, most people can’t figure out why.

Your muscles don’t know hard from easy

This is the part most people have never heard explained. Your muscles don’t grade effort. They don’t distinguish between something that feels manageable and something that feels difficult. They only know one thing, how much work they can sustain before they can no longer keep up.

When that limit is reached without enough endurance capacity built underneath, other muscles compensate. And that compensation is where the cycle starts over, often without any single moment you can point to as the cause.

Why “it felt fine” isn’t the signal you think it is

Feeling fine during an activity is how your mind interprets effort, not your muscles’ report on capacity. You can feel completely comfortable doing something your system isn’t actually ready to sustain.

The feedback often comes later, hours after, the next morning, or after a few days back in the routine. By then, most people don’t connect it back to the activity. They assume something else caused it. The pattern continues.

Feeling fine is where you start. It’s not where readiness is measured. Those are two different things.

What returning too soon actually does

When you return to a routine before the foundation is in place, you’re not picking up where you left off. You’re loading a system that hasn’t fully rebuilt its capacity.

The body adapts, but it adapts by compensating, not by performing correctly. Over time those compensations become patterns. And patterns become the new normal, until something gives.

How to know when the foundation is genuinely in place

Readiness isn’t about pain level. It’s about capacity. A few honest markers worth considering:

• Can you sustain the activity, not just start it, without form breaking down or symptoms building
• Are you consistent over time, not just feeling good on one day
• Has the foundational work felt sustainable, not just manageable in the moment
• Are you returning gradually and intentionally, not all at once

Readiness is built, not felt. When the foundation is there, returning to your routine doesn’t set you back, it moves you forward.

Muscular endurance isn’t exclusive to one group of muscles. Every muscle needs it. What we’re focusing on today is where it’s often overlooked and why that matters.

What muscular endurance actually means

Simply put, muscular endurance is your muscle’s ability to sustain repeated contractions or maintain a position over time without fatiguing. It’s not about how much you can lift. It’s about how long your muscles can keep working before they give out.

Every movement you make, holding your posture, walking down the street, carrying something across a room, requires muscular endurance. It’s happening constantly, whether you’re aware of it or not.

Why the stabilizing and postural muscles deserve specific attention

These muscles are designed to work continuously at low intensity for long periods. They don’t produce big powerful movements, they support, align, and protect while everything else moves around them.

Because they don’t fatigue dramatically or visibly the way larger muscles do, it’s easy not to notice when they’re undertrained. They rarely announce themselves. But when they’re not doing their job, other muscles step in and compensate.

That compensation is often where pain, stiffness, and injury quietly begin, not from one big event, but from a foundation that hasn’t been fully maintained.

What “undertrained” actually looks like

It doesn’t always look like weakness. It often looks like this:

• Fatigue or discomfort after sustained positions, long periods of sitting, standing, or walking
• A feeling of tightening or guarding that builds through the day
• Losing form or control as an activity continues, even when the start feels fine
• Symptoms that improve briefly then return without a clear reason

None of these are signs of damage. They’re often signs of endurance capacity that hasn’t been built yet, or that has been gradually lost over time without enough targeted work to maintain it.

How muscular endurance is trained

Muscular endurance is built through lower load, higher repetitions, sustained holds, and controlled movement quality. It requires consistency over time, not intensity.

This is exactly why the exercises that build it can feel unglamorous. There’s no dramatic effort. No heavy weight. No moment where you feel like you’ve done something big. But the adaptation happening underneath is real, and it’s what allows everything else in your body to work better, longer, and with less compensation.

The quiet work is the important work. It always has been.

You’ve probably heard it your whole life, walk every day and you’ll stay healthy. And that’s not wrong. But if you’re recovering from an injury or managing a musculoskeletal condition, understanding what walking actually trains, and what it doesn’t, can completely change how you approach your exercise routine.

A little history worth knowing

The “20 minutes a day” message many of us grew up with wasn’t originally about walking at all. It started as a recommendation for vigorous exercise, three days a week, part of the early guidelines from the American College of Sports Medicine, published in the 1970s and 80s, when research was focused on hard cardio and fitness performance.

Over time, as research evolved, the message shifted toward moderate-intensity activity, and walking became the simplified, accessible version of that recommendation for the general public. That message is still valid. For cardiovascular health, consistent walking matters.

But cardiovascular health and musculoskeletal health are two different goals. And that distinction is worth understanding.

What walking actually trains

Walking is primarily a cardiovascular endurance activity. It challenges your heart, lungs, and circulation, and those are real, meaningful benefits.

But walking does not meaningfully train:

• The muscular endurance of your stabilizing muscles
• Postural control and alignment
• The movement mechanics your body relies on every day

These are different systems. And for musculoskeletal health, whether you’re recovering from something or working to stay ahead of injury, those systems matter enormously.

Why that distinction matters, not just during recovery

This isn’t only a conversation for people who are injured. Whether you’re healing or simply trying to maintain function and avoid problems down the road, your body needs more than cardiovascular endurance to move well and stay resilient.

When the stabilizing muscles are undertrained and movement patterns go unchecked, walking can quietly reinforce those gaps. You may be covering distance, but you’re practicing on a foundation that hasn’t been fully built, or one that’s gradually declining without targeted muscular endurance and strength work to support it. More steps alone won’t change that.

The foundation everything else is built on

This is where most people want to skip ahead.

The exercises that target these foundational areas may feel slow, repetitive, even a little boring compared to the routine you’re used to. That’s understandable. But they exist for a specific reason, and it matters.

Muscular endurance, postural control, and movement quality are the foundation on which everything else is built. Your walk. Your workout. Your ability to do the things you enjoy without pain or setback.

Without that foundation in place, you’re layering a familiar routine on top of an unstable base. The body adapts, but it adapts to whatever pattern you give it, compensations included.

The “boring” work isn’t the detour. It’s the road. And once that foundation is solid, returning to the activities you love, including walking, becomes more productive, more sustainable, and more effective than if you’d skipped ahead to get there.

I want to repeat something, but this time, with a little more context.

Because this is one of the most common reasons symptoms return.

When things start to feel better, it’s natural to do more.

More walking. More activity. More exercise.

And on the surface, that seems like the right move.

But this is where many people unknowingly run into trouble.

Not because what they’re doing is wrong, but because of when and how often they’re doing it.

So if you’ve heard this before, that’s intentional.

Because this one concept makes a big difference.

After doing something new or increasing your activity, notice how your body responds the next day.

• If it feels the same or better, you’re likely on the right track
• If it feels slightly sore but settles within 24 hours, usually okay
• If it’s clearly worse, your body likely needed more time before repeating that level of activity

This is where many people get tripped up.

They feel good in the moment. So they repeat it again the next day. Or they add a little more before their body has fully adapted.

That’s when symptoms tend to come back. It’s not because the activity was wrong. It’s because the timing was off.

Progress requires both: doing the right things, and allowing enough time for your body to respond.

And that second part, the timing, is the piece most people overlook. That’s why this is worth repeating. Because when you understand this, it becomes much easier to keep moving forward without setbacks.

Most people try to do something to stay active.

Walking. Yoga. Weight training.

And that’s a good thing. But there’s one piece that often gets missed.

Exercise isn’t just one thing. It’s made up of three key components:

Strength. Endurance. Flexibility

Most people naturally focus on one. But over time, that’s where problems can start to develop.

Each component plays a different role. And they’re all needed to support proper movement.

When one is missing, mechanics often become unbalanced over time. And that’s when things start to feel off. Not always right away, but gradually.

If you’re consistently doing the same type of activity, it’s easy to miss what’s not being addressed. And over time, that gap matters.

A simple way to think about it: it’s not just about staying active. It’s about making sure your body is being supported from all three areas.

So here’s something to consider: does your current routine include strength, endurance, and flexibility? Or are you mainly focused on one type of activity?

This is something I see often.

You start feeling better. You’re moving more. You begin getting back to your normal routine.

And then, symptoms return.

It can feel confusing, especially when it seemed like things were improving. In most cases, this isn’t random. It usually comes down to how activity and recovery were managed as you started doing more.

Two things tend to happen:

• Activity increases faster than the body is ready for
• Recovery time between those activities gets reduced

Even when the exercises or movements are “correct,” small changes in how they’re done, or how often they’re repeated, can shift the outcome.

Exercise and recovery are not the same

Exercise is what you ask your body to do. Recovery is what allows your body to adapt to that demand.

When you’re returning from an injury or irritation, that balance matters even more. More activity doesn’t always mean faster progress. In many cases, it requires more time between efforts, not less.

A simple way to guide yourself as you return to activity: after doing something new or increasing your activity, notice how your body responds the next day.

• If it feels the same or better, you’re likely on the right track
• If it feels slightly sore but settles within 24 hours, usually okay
• If it’s clearly worse, your body likely needed more time before repeating that level of activity

That doesn’t mean stop. It just means adjust, either the amount, or the time between sessions.

Most setbacks don’t come from one moment. They come from doing a little more than your body was ready for, a little too often. When you understand that pattern, you can start to guide your progression more clearly, and avoid getting stuck in that cycle.

This is something I get asked all the time, especially when people are doing their home exercises or getting back into a routine.

“How do I know if I’m doing too much, or not enough?”

It’s a good question. Because the goal isn’t to avoid discomfort completely, but it’s also not to push through everything.

So here’s a simple way to guide yourself when you’re exercising:

1. During the exercise

If it feels like stiffness, tightness, or even mild cramping, and it actually improves as you continue, that’s usually okay. That’s often your body loosening up.

2. After you finish

If you still feel it, but it’s mild, that can be normal. Use ice to help calm things down. If it settles later that day but comes back the next time you do that exercise, that’s a sign the area may need more flexibility or adjustment before progressing.

3. The next day

If it’s still there the next day, or feels worse, you likely just did too much. Your body needs a bit of recovery before returning to that activity. Try backing off about 25 to 50% and give it a day or two to settle before trying again.

Take that as a sign to be careful, this level of activity may be too demanding for your body right now and could lead to injury if you keep pushing it.

Use this as a general framework, not a strict rule. And when in doubt, you can always reach out for guidance. The goal isn’t to push through everything, it’s to apply the right amount of stress so your body can respond and improve.