You can squat without pain.
You load the bar.
Everything feels strong.
Then you try a lunge.
Suddenly, your knee hurts.
If you are active in Fort Collins or anywhere in Northern Colorado, this is a complaint we hear often. Many people can squat, bike, or even run without much discomfort, but lunges seem to bring on knee pain almost immediately.
The good news? Lunges are rarely the problem.
Why Lunges Feel Different
Unlike squats, lunges challenge one leg at a time.
That means each hip, knee, and ankle has to stabilize your body on its own. Small weaknesses that stay hidden during two-legged movements become much more noticeable.
This is why lunges are often one of the first exercises to become painful.
At UpSlope Physical Therapy and Performance, we use movements like lunges to identify strength and mobility deficits that other exercises may hide.
What Is Actually Causing the Pain?
Most knee pain during lunges is not caused by damage inside the knee.
Instead, it is often the result of poor load distribution.
Common contributors include:
- Weak hip muscles
- Limited ankle mobility
- Poor balance and single-leg stability
- Reduced quad strength
- Doing more volume than your body is prepared for
When these areas are not doing their job, your knee absorbs more stress with every repetition.
Should Your Knee Go Over Your Toes?
This is one of the biggest myths in fitness.
Your knee is designed to move over your toes.
In fact, avoiding that position completely often forces other joints to compensate.
The goal is not to keep your knee behind your toes.
The goal is to have enough strength and mobility to control the movement.
Quality matters more than where your knee ends up.
How To Make Lunges Feel Better
You do not have to avoid lunges forever.
Start by improving your movement quality.
Reducing the depth, using support for balance, or adjusting your stance can help while you build strength.
At the same time, work on improving hip strength, ankle mobility, and quad capacity.
As those areas improve, your knee becomes better equipped to handle the demands of the exercise.
Progress gradually instead of trying to force through pain.
When To Get It Checked
If lunges consistently cause knee pain, your symptoms continue after the workout, or your knee begins hurting during other activities, it is time to take a closer look.
Addressing the problem early is much easier than waiting until it starts affecting everything else you do.
The Bottom Line
Lunges are one of the best exercises for building strength, balance, and stability.
They should not be something you fear.
If your knee hurts every time you lunge, there is usually a reason.
At UpSlope Physical Therapy and Performance in Fort Collins, we can identify what is causing the pain and build a plan that helps you move with confidence again.
The goal is not to avoid challenging movements.
The goal is to become strong enough to own them.
Frequently Asked Questions
Why do lunges hurt my knee when squats don't?
Lunges load one leg at a time, so each hip, knee, and ankle has to stabilize your body on its own. Weaknesses that stay hidden during two-legged movements show up immediately. The lunge isn't the problem — it's revealing one.
Should my knee go past my toes during a lunge?
This is one of the biggest myths in fitness. Your knee is designed to travel forward over the foot. Restricting it usually shifts stress elsewhere rather than removing it.
Do I need to stop lunging if it hurts?
Usually no. Most people can keep training with modified range, load, or volume while the underlying hip strength, ankle mobility, and single-leg control are addressed.
