Why Strength Is Not Always the Answer to Pain During Exercise
Pain during exercise is not always a sign of weakness. Many people assume that if a muscle becomes painful during activity, it must be weak, and they focus on strengthening programs in the hope of solving the problem. While strength certainly has its place, it may not always be the missing piece.
At Spinewise, we frequently see people who experience discomfort only after a period of activity. They feel fine at the start of a run, walk, bike ride, or workout, but symptoms begin to appear after several minutes or kilometres. In many cases, the issue may have less to do with strength and more to do with fatigue resistance and energy production.
What Is Fatigue Resistance?
Fatigue resistance refers to a muscle’s ability to continue performing efficiently over time.
A muscle may be capable of producing a large amount of force for a short period, but that does not necessarily mean it can sustain activity for longer durations. This is why someone may perform well in a strength test yet still develop discomfort during repetitive movement.
When muscles fatigue, movement patterns often change. The body may begin compensating, loading different tissues, altering posture, or recruiting other muscles to assist. Over time, these changes can increase stress on joints, tendons, ligaments, and surrounding muscles, contributing to pain and injury.
Why Pain Often Appears During Repetitive Activity
One of the most common signs of reduced fatigue resistance is pain that develops partway through an activity.
For example, a runner may feel perfectly comfortable during the first few kilometres before knee pain, hip tightness, or back discomfort begins to appear. The same pattern can occur during cycling, walking, swimming, gym training, or even prolonged sitting.
In many cases, the problem is not the initial movement. The issue is the body’s ability to repeat that movement efficiently over time.
As fatigue develops, movement quality often declines. Small changes in coordination, stability, and muscle recruitment can accumulate, eventually leading to discomfort.
Energy Production Matters More Than Most People Realise
When discussing muscle performance, people often focus on strength, flexibility, or endurance. However, one of the most overlooked factors is energy production.
Every muscle contraction requires energy. If a muscle cannot efficiently produce and utilise energy, fatigue can occur sooner than expected.
This process depends on multiple systems throughout the body, including blood flow, oxygen delivery, mitochondrial function, nervous system regulation, nutrient availability, and metabolic health. If any of these factors become compromised, muscles may struggle to maintain performance during repetitive activity.
Improving muscle function is not always about making a muscle stronger. Sometimes it is about helping the body become more efficient at producing and using energy.
Looking Beyond Strength Training
Strength training remains an important part of physical health and injury prevention. However, if pain consistently develops during repetitive activity despite getting stronger, it may be worth looking deeper.
Factors such as movement efficiency, balance, coordination, recovery capacity, energy production, nervous system function, and muscle endurance can all influence fatigue resistance. Addressing these areas may help explain why symptoms only appear after prolonged activity rather than immediately.
At Spinewise, we assess more than just strength and flexibility. We look at the factors that influence how efficiently the body moves and performs over time. If you experience pain that develops during exercise, running, walking, or repetitive activities, book an appointment with the Spinewise team to help identify what may be contributing to reduced fatigue resistance and ongoing discomfort.
Frequently Asked Questions
Fatigue resistance is the ability of a muscle or body system to continue functioning efficiently over an extended period without a significant decline in performance.
Pain that develops during a run may be related to fatigue resistance, movement efficiency, coordination, energy production, or stability rather than simply a lack of strength.
In many cases, yes. Strength and endurance are different qualities. A muscle may generate high levels of force yet still struggle to maintain performance during prolonged or repetitive activity. This is one reason a full assessment of movement and muscle function, rather than strength testing alone, can provide a more complete picture.
It can. Muscles rely on efficient energy production to sustain movement. When energy production becomes less efficient, fatigue may occur more quickly, potentially affecting movement quality and comfort during activity.
This depends on the nature, location, and severity of the pain, which is why professional guidance is valuable. As a general principle, sharp, sudden, or worsening pain during exercise warrants stopping and seeking assessment. Pain that builds gradually during activity and settles afterwards may indicate a fatigue or load management issue rather than an acute injury, but this should still be evaluated rather than ignored. Continuing to push through pain without understanding the cause may delay recovery or increase the risk of injury.
At Spinewise, we assess movement patterns, nervous system function, balance, coordination, recovery capacity, and other factors that may influence fatigue resistance. This helps identify potential contributors to pain that develops during repetitive activity.