Why Do Some People Train Too Hard? The Psychology Behind Destructive Exercise
When Exercise Becomes a Way to Escape, Control and Prove Yourself
Exercise is usually associated with health. We know that regular physical activity can improve mood, support cardiovascular health, increase physical strength and contribute to better psychological well-being. It can also improve how we perceive our bodies and our physical abilities. Recent meta-analyses have found that exercise interventions can improve physical self-worth, perceived competence, physical condition and other aspects of physical self-perception.
So why does exercise sometimes become something destructive? Why does a person continue training when they are exhausted, injured or clearly in need of recovery? Why can missing one workout create guilt or anxiety? Why can someone feel that they have to train even when they no longer enjoy it?
The answer is usually more complicated than simply "too much motivation". There is no single psychological profile of a person who exercises excessively. For some people, the behaviour is strongly connected to body image or eating concerns. For others, it can be related to perfectionism, self-esteem, emotional regulation, control or the need to escape difficult internal experiences. Biological predispositions can also influence how rewarding physical activity feels and how strongly a person is drawn towards movement.
It is also important to distinguish between a high level of training and compulsive exercise. An athlete may train many hours a week without having a problematic relationship with exercise. The more relevant question is whether the person can remain flexible. Can they rest when their body needs it? Can they change their plan? Can they miss a session without experiencing disproportionate guilt or anxiety? And most importantly, can they choose not to exercise?
When exercise becomes a way of regulating emotions
One of the most interesting psychological aspects of excessive exercise is its relationship with emotion regulation. Exercise genuinely changes how we feel. Physical activity can reduce stress and anxiety and can produce changes in mood and arousal. This is normally one of its benefits. However, the same mechanism can become problematic when exercise becomes the person's main or only strategy for dealing with difficult emotions.
Research supports a relationship between emotion regulation difficulties and compulsive exercise. In a prospective study following 572 adolescents over 12 months, dysfunctional emotion regulation predicted later compulsive exercise, even after controlling for initial levels of compulsive exercise. The researchers suggested that compulsive exercise may function as a maladaptive strategy for regulating emotions.
This can create a reinforcing cycle. A person experiences anxiety, anger, sadness, shame or emotional tension, goes for a run or starts an intense workout, experiences temporary relief and consequently becomes more likely to use exercise the next time the same emotional state appears. There is nothing inherently wrong with using movement to feel better. The problem begins when exercise becomes necessary for emotional stability. A person may gradually stop learning other ways of processing difficult experiences because exercise works so quickly. Instead of asking themselves what they are feeling and what they need, they automatically reach for their training shoes. Over time, the question may no longer be "Do I want to exercise today?" but "How will I cope if I don't?"
Sometimes we are not running towards something, but away from something
This is particularly interesting when we think about avoidance. Imagine someone has had a difficult day. Perhaps they had an argument with their partner, received criticism at work or experienced something that triggered feelings of rejection or inadequacy. They come home feeling emotionally overwhelmed and immediately go running. During the run, their attention becomes focused on pace, breathing, distance and physical sensations. Their thoughts become more organized. Their emotional intensity decreases. Afterwards, they feel calmer. The run has provided genuine relief. But what happened to the original emotion? It may simply have been postponed. If this pattern is repeated often enough, exercise can become a form of experiential avoidance. Instead of learning that difficult emotions can be experienced, understood and tolerated, the person learns that uncomfortable internal states need to be changed as quickly as possible.
This distinction is important because emotional regulation and emotional avoidance are not the same thing. Healthy regulation might mean that I exercise because I am stressed, feel better afterwards and can then return to the situation and deal with what happened.
Avoidance looks different. I exercise because I cannot tolerate what I am feeling, and the purpose of the workout is primarily to get away from the feeling itself. The behaviour can look identical from the outside. Psychologically, however, it serves a very different function.
Could intense exercise be connected to dissociation?
Dissociation is another concept worth considering, particularly when we are talking about people who have experienced overwhelming or traumatic experiences. However, this area requires some caution because research does not support the idea that excessive exercise is generally a form of dissociation.
Dissociation can involve a reduced sense of connection with one's emotions, body, surroundings or sense of self. In some people, difficult emotional experiences can lead to a tendency to disconnect from internal states rather than consciously process them. For someone with this pattern, intense physical activity may sometimes make it easier to remain focused on external or physical sensations rather than emotional experience. The body is busy, attention is directed towards performance and there is little mental space for uncomfortable thoughts or feelings.
This does not mean that every person who runs for an hour is dissociating. It also does not mean that exercise causes dissociation. Rather, for some individuals, particularly those who already have difficulties staying connected with their emotional experience, intense exercise may become another way of moving away from internal discomfort. A useful question is therefore not simply "How much do I train?" but "What happens inside me when I stop?" If stopping exercise makes a person suddenly aware of emotions they have been avoiding, that information may be more psychologically important than the number of kilometres they run.
The need for control
Another common mechanism is control. When life feels unpredictable, the body can become an area where control seems possible. A person may not be able to control what their partner thinks, whether their employer appreciates them, what happens in their family or how they feel emotionally. But they can control their training schedule, the number of kilometres they run, the weight they lift, their food intake or the number on the scale. This can provide a strong sense of safety. For someone who feels overwhelmed by uncertainty, strict training rules can create structure. The problem is that the structure can gradually become rigid. What initially provided stability starts to control the person instead.
This is one reason why rest can become psychologically difficult. Rest is not simply an inactive day anymore. It can represent loss of control, guilt or the fear of falling behind.
The person may know intellectually that recovery is necessary, but emotionally experience rest as something dangerous or unacceptable.
When discipline becomes part of self-worth
Another important factor is self-esteem. Exercise can genuinely improve how people perceive their physical abilities and their bodies. That is one of its positive psychological effects. Research has consistently found improvements in aspects of physical self-perception following exercise interventions, although the strength of the effects varies between studies and populations. But there is a significant difference between exercise contributing to healthy self-esteem and exercise becoming the foundation of self-worth.
For some people, achievement becomes a way of proving that they are valuable. They may feel competent when they reach a new personal record, complete a difficult workout or maintain a strict routine. The problem appears when the opposite experience becomes unbearable. If I only feel good about myself when I am productive, disciplined, attractive or physically strong, then rest can start to feel like failure. This creates a very fragile form of self-esteem because it depends on continued performance.
The person does not simply think, "I am proud that I am strong."
The underlying belief can become, "I am worthy because I am strong."
Those two statements may sound similar, but psychologically they are very different.
In the first case, physical ability is one part of the person's identity. In the second, it becomes evidence of personal worth.
This can explain why some people continue pushing themselves long after exercise has stopped being enjoyable. They are no longer only training their bodies. They are trying to maintain a certain version of themselves.
Perfectionism can make "enough" almost impossible
Perfectionism is another factor that repeatedly appears in research on compulsive exercise.
A person with perfectionistic tendencies may set very high standards for themselves and be particularly critical when they fail to meet them. This can turn exercise into an endless project because there is always something that could be improved. The body can become stronger, leaner or more capable, but the internal standard moves at the same time.
A 2025 systematic review and meta-analysis found a significant positive association between perfectionism and compulsive exercise. Across seven studies involving 3,117 participants, total perfectionism, perfectionistic strivings and perfectionistic concerns were all associated with higher levels of compulsive exercise. The authors also emphasized that most of the available research was cross-sectional, so the findings do not prove that perfectionism causes compulsive exercise. This distinction matters.
Perfectionism does not automatically lead to destructive exercise, and ambitious people are not necessarily exercising compulsively. However, when high standards are combined with harsh self-criticism and difficulty accepting mistakes or limitations, exercise can become another area in which a person constantly feels that they are not doing enough.
The internal standard becomes difficult to satisfy because "good" is never quite good enough.
But what about genetics?
It is tempting to look for a simple biological explanation, especially when someone seems naturally driven to exercise. Genetics do appear to influence physical activity. Family and twin studies suggest that individual differences in physical activity have a substantial heritable component, although estimates vary depending on how activity is measured. A review of the available evidence reported heritability estimates of approximately 51 to 56% when physical activity was measured using accelerometers. This does not mean there is a gene responsible for exercise addiction.
Physical activity is a complex behaviour influenced by many biological and environmental factors. Researchers have investigated genetic pathways associated with motivation, reward and activity levels, but the evidence is not strong enough to say that particular genes determine whether someone will develop compulsive exercise.
Genes may contribute to differences in temperament, reward sensitivity, activity preference or vulnerability to compulsive behaviours, but they interact with experience and environment. This is an important distinction because biological vulnerability does not equal psychological destiny. A person may have a strong natural drive for movement and still develop a very healthy relationship with exercise. Another person may not be particularly athletic but can develop rigid and compulsive exercise patterns because of body image concerns, perfectionism, emotional distress or other psychological factors.
Why exercise can become so reinforcing
There is also a biological reason why exercise can become such a powerful coping mechanism. Exercise affects several neurobiological systems involved in reward and mood. Running, in particular, has been associated with changes in endogenous opioid and endocannabinoid signalling, which may contribute to the pleasurable sensations sometimes described as the "runner's high". These biological effects can make exercise genuinely rewarding.
This creates an interesting psychological situation. A person exercises because they are distressed, feels better after exercising and then becomes more likely to exercise when distressed again. The behaviour is reinforced because it produces a desirable internal change.
That does not necessarily mean the person is addicted in the clinical sense. In fact, "exercise addiction" is still a debated construct and is not formally recognized as a distinct disorder in the DSM-5 or ICD. Researchers continue to discuss how it should be defined and differentiated from compulsive exercise, particularly exercise associated with eating disorders. Nevertheless, the underlying principle is important: behaviours that reliably reduce distress or provide reward can become increasingly difficult to give up.
The difference between training hard and training destructively
Training hard is not inherently unhealthy. Someone can enjoy challenging workouts, have ambitious athletic goals and deliberately push their physical limits while still maintaining a flexible relationship with exercise. They can take rest days, change their programme when necessary and recognize that recovery is part of progress.
The problem is not intensity itself. It is the psychological relationship with the behaviour. A person may be moving towards a problematic pattern when they repeatedly exercise despite injury or illness, feel intense guilt when they cannot train, become extremely anxious when their routine is interrupted, use exercise to compensate for food, or organize their life around training to such an extent that relationships, work, sleep or recovery are affected.
Another important sign is the loss of choice.
When someone says, "I love training and I choose to do it," that is very different from, "I don't want to train today, but I feel like I have no choice." The second statement tells us much more about the psychological function of the behaviour than the number of hours spent exercising. What happens when the workout is taken away? Perhaps one of the most useful questions is what remains when exercise is removed.
If a person suddenly has an injury and cannot train for several weeks, what happens psychologically?
Do they simply miss movement?
Or do they feel worthless, anxious, ashamed, restless or completely lost?
Do they struggle because their body is not moving, or because they no longer have access to the strategy they normally use to regulate their emotions?
This can reveal something important.
Sometimes excessive exercise is not primarily about wanting a better body or better performance. It may be about wanting a different internal state. The workout can provide relief from anxiety, distance from painful emotions, a sense of control, evidence of competence or temporary protection from feelings of inadequacy. In that situation, telling someone simply to "exercise less" may not solve the underlying problem. If exercise is their main way of regulating distress, taking it away without developing other coping strategies can leave them feeling even more overwhelmed.
The psychological work therefore needs to go deeper. It may involve learning to tolerate difficult emotions, developing more flexible thinking, separating self-worth from performance, understanding perfectionistic beliefs and becoming more comfortable with rest and uncertainty. It may also involve learning to recognize the difference between exercising because the body wants movement and exercising because the mind cannot tolerate what happens without it.
The goal is not to become less disciplined
There is nothing wrong with discipline, ambition or enjoying physical challenge. In fact, these qualities can be valuable. The question is whether discipline remains flexible. A healthy relationship with exercise allows a person to work hard when their body is ready, but also to recover when it is not. It allows them to enjoy progress without needing achievement to prove their worth. It allows movement to be one way of regulating emotions without becoming the only way. Most importantly, it leaves room for choice.
Exercise can be a way of connecting with the body rather than escaping from it. It can build confidence without becoming the source of identity. It can help regulate emotions without becoming a way of avoiding them. And perhaps this is the most useful distinction to remember: the same workout can be healthy for one person and psychologically problematic for another, depending on what function it serves. Sometimes we train because we love what our bodies can do. Sometimes we train because we are afraid of what we might feel if we stop. Understanding the difference can be much more important than simply counting workouts.
References
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Zhang, X., & Speakman, J. R. (2019). Genetic Factors Associated With Human Physical Activity. Endocrinology, 160(4), 840–852.
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