Tendon Rehabilitation: Why Strength Training Is the Key to Sustainable Recovery

5 July 2026

By Joris Jellasics
Co-Founder ORBIT - Performance Specialist -

Tendon pain can be frustrating.

At first, you may only feel some stiffness in the morning, mild pain during running, or a nagging sensation after training. You assume it will settle. You rest a little, maybe apply some gel, do a few stretches and then try to build up again.

But every time, it comes back.

Achilles tendon. Patellar tendon. Hamstring tendon. Hip tendon. Shoulder tendon. The location may differ, but the story is often the same: the tendon is no longer tolerating load well enough.

At ORBIT, we do not see tendon pain as something you simply need to “rest away”. We see it as a load capacity problem that needs to be rebuilt in a structured way.

Rest can temporarily reduce pain. But rest alone usually does not make a tendon stronger.

For that, you need progressive strength training.

Why tendons recover differently from muscles

A muscle can respond relatively quickly to training or rest. A tendon reacts more slowly.

Tendons are designed to transfer force between muscle and bone. They need to pull, spring, store energy and release it again. During running, jumping, sprinting, decelerating or strength training, tendons have to tolerate very high forces.

When the load becomes greater than what the tendon can currently handle, irritation can develop. This often does not happen because of one wrong movement, but because of an accumulation of load: more kilometres, more jumping, more intensity, new shoes, a different surface, too little recovery or a sudden spike in training.

So the problem is rarely just “the tendon”.

The problem is the relationship between load and load capacity.

That is why good tendon rehabilitation needs to do two things:

calm the pain down in the short term
and rebuild the tendon for what your sport demands.

Why complete rest is usually not the solution

Many people with tendon pain stop exercising completely as soon as pain appears. That is understandable, but not always ideal.

In cases of strong irritation, a short period of relative rest may be necessary. But long periods of complete rest often reduce the capacity of the tendon and surrounding muscles. You may feel less pain for a while, but as soon as you start running, jumping or training again, the problem returns.

A tendon needs load to become stronger.

But that load has to be chosen correctly.

Too little load does not create adaptation.
Too much load keeps the problem going.
The right load builds capacity.

That is the core of tendon rehabilitation.

The first phase: calming the pain without stopping everything

In the first phase, we mainly want to control the tendon’s response.

That does not mean you are not allowed to do anything. It means we temporarily reduce the most provocative loads. With Achilles tendon pain, that may mean fewer hills, less speed work, fewer jumps or lower running volume. With patellar tendon pain, that may mean temporarily reducing deep knee bends, jump work or explosive sport-specific load.

The goal is to calm the tendon down without losing your entire physical base.

In this phase, isometric exercises can be useful. These are exercises where you produce force without much joint movement. Examples include a static calf raise hold for Achilles tendon pain or a wall sit/split squat hold for patellar tendon pain.

Isometric exercises can help control pain in the short term while still keeping some load on the tendon. They are not a magic solution, but they can be a good first step.

Important in this phase:

• avoid sudden spikes in load

• keep moving within acceptable pain

• temporarily reduce the most irritating triggers

• start with controlled strength exercises

• monitor how the tendon responds in the 24 hours after loading

Some pain during exercise is not always dangerous. But if the pain clearly increases, you feel much stiffer the next morning, or your sports load becomes harder to tolerate, the stimulus was probably too much.

When should you see a physiotherapist?

You do not need to worry immediately about every mild tendon irritation. Sometimes it is enough to adjust your load for a few days.

But there are moments when it is better not to keep pushing through.

It is best to see a physiotherapist when:

• the problem keeps returning for more than one to two weeks

• you repeatedly feel pain during running, jumping or sport

• morning stiffness remains clearly present

• you constantly have to adjust training because of pain

• the pain improves with rest but immediately returns during build-up

• you notice strength loss or clear left-right differences

• you are in a competitive period and do not know what you can still do

• you have already relapsed several times

The earlier you manage the load properly, the smaller the chance that a temporary irritation becomes a long-term problem.

At ORBIT, we often see athletes only after they have tried to “push through” for weeks or months. At that point, recovery is usually still possible, but the process often takes longer. Tendons like clear, consistent progression. The sooner that progression is correct, the better.

The second phase: building strength

Once the tendon becomes calmer, we need to build capacity.

This is where strength training becomes central.

Not a few random exercises as a warm-up. Not only stretching. Not only massage. But a clear and progressive strength plan.

Depending on the tendon and the sport, we work with controlled, slow strength training. This is often referred to as heavy slow resistance: relatively heavy exercises performed slowly and with control.

Why slow and heavy?

Because tendons and muscles need enough mechanical tension to become stronger. By working in a controlled way, we can load the tendon sufficiently without immediately adding the explosive peak loads of sprinting, jumping or competition.

Examples include:

The exercise itself matters, but the dosage matters even more.

How heavy?
How many sets?
How often per week?
How much pain is acceptable?
When do we increase the load?
When do we reintroduce sport?

That is the difference between “doing an exercise” and doing real rehabilitation.

The third phase: from strength to explosive load

A tendon can become stronger in the gym, but your sport demands more than controlled strength.

An Achilles tendon needs to spring during running and sprinting.
A patellar tendon needs to tolerate high forces during jumping, landing and decelerating.
A hamstring tendon needs to produce force during acceleration and high-speed running.
A shoulder tendon needs to respond during throwing, pushing, pulling or contact situations.

That is why, after the basic strength phase, we continue towards faster and more sport-specific loading.

This can include:

This phase is often forgotten. Someone feels better in daily life, can do strength training again, but is not yet prepared for the speed and chaos of sport.

That is exactly where many relapses happen.

Tendon rehabilitation therefore does not stop when the pain is gone. It stops when the tendon is once again prepared for the load you need it to tolerate.

Return to sport: more than being pain-free

Being pain-free is important, but it is not enough.

For a safe return to sport, we want to know whether the tendon and the full movement chain have enough capacity again.

At ORBIT, we look at, among other things:

• maximal strength

• strength endurance

• left-right differences

• jump capacity

• reactive strength

• running or movement mechanics

• sport-specific load

• the tendon’s response after training

• fatigue and recovery

A tendon can feel fine during training but react clearly the next morning. That is why we do not only look at what you can do during the session, but also at how your body responds afterwards.

Return to sport is not one moment where you are suddenly “healed”. It is a gradual process in which we test step by step whether your body is ready for the next stimulus.

The ORBIT approach to tendon pain

At ORBIT, we do not start with a standard list of exercises.

We start by understanding why your tendon is becoming overloaded.

That is why we first map out your story and context:

• What sport do you do?

• When did the pain start?

• What load changed recently?

• What triggers the pain?

• How does the tendon feel the next morning?

• What competitions or goals are coming up?

• What previous injuries are relevant?

• What does your training week look like?

We then combine clinical assessment with objective testing where needed. We look at strength, mobility, movement control, jump capacity, running load and weak links in the chain.

Based on this, we build a trajectory with clear phases:

First calm it down.
Then strengthen it.
Then speed it up.
Then integrate it into sport.

The goal is not only to make the pain disappear. The goal is to help you understand how to load your tendon better in the future, make it stronger and reduce the risk of relapse.

Why prevention matters so much for tendons

Many tendon problems return because the underlying issue was never really addressed.

The pain disappears, the athlete starts again, the load increases, and a few weeks later the same tendon becomes irritated again.

Prevention does not mean you need to be careful forever. It means you keep working structurally on the capacity your sport demands.

For many athletes, that means:

• maintaining strength training

• gradually building running or jumping load

• avoiding sudden spikes in training volume

• allowing enough recovery

• paying attention to shoes, surface and training planning

• not returning too quickly to maximal intensity

• integrating strength and plyometrics intelligently during the season

A strong tendon is not a coincidence. It is the result of consistent, well-planned loading.

What can you already do yourself?

If you are developing early tendon pain, a few things often help.

Temporarily reduce the loads that clearly provoke the pain, but do not automatically stop everything. Find a form of movement you tolerate well. Track how your tendon responds both during activity and the morning after. Do not increase volume, intensity and frequency all at once. And do not just start random exercises you found online.

Most importantly: do not wait too long if the problem keeps coming back.

Tendon pain often improves with the right approach, but rarely by ignoring it for months.

Coming back stronger than before

A good tendon rehabilitation process is not just about becoming pain-free.

It is about building capacity.

The tendon needs to tolerate load again. The muscle needs to produce force again. The body needs to regain confidence in speed, impact and sport-specific movement.

At ORBIT in Leuven, we guide tendon rehabilitation with a sport-focused and data-informed approach. We combine physiotherapy, strength training, testing, load management and return-to-sport guidance to help you return not just to movement, but to sustainable sport.

Not just less pain.

More capacity.

Do you have tendon pain that keeps coming back?

Are you dealing with Achilles tendon pain, patellar tendon pain, hamstring tendon pain, hip tendon pain, shoulder tendon pain or another recurring tendon problem?

Book an intake at ORBIT in Leuven. We assess your pain, strength, load and sport goals, then build a plan towards stronger, smarter and more sustainable movement.