The research on exercise and mental health is more specific than the general claim suggests. The specifics make it more useful.
The claim that exercise is good for mental health is repeated often enough to have become background noise. It is also true, and the research behind it is more specific and more useful than the general version implies.
Kayla Bonkowski trains in CrossFit in Sterling Heights, Michigan, and has lost more than 70 pounds through consistent training. She is completing her MSW with a focus on hospice and palliative care and holds a Cum Laude psychology degree from Rochester College. When she talks about exercise and mental health, she is drawing on both direct experience and the clinical literature she studied formally.
What the Research Actually Shows
The research is clearest for aerobic exercise performed at moderate to vigorous intensity, at least three times per week. That category includes CrossFit. The documented effects include meaningful reduction in symptoms of depression and anxiety — with effect sizes for mild-to-moderate depression that are comparable to antidepressant medication — improved sleep quality, reduced physiological stress markers, and improved cognitive function, particularly in attention and executive function.
The mechanisms are biological, not motivational. Exercise increases brain-derived neurotrophic factor, which supports neural health and plasticity. It affects serotonin, dopamine, and norepinephrine through pathways that overlap with those targeted by antidepressant medications. It activates and then regulates the body’s stress response systems in ways that, over time with consistent training, produce a more calibrated and efficient response to stress. These are measurable changes, not aspirational ones.
Self-Efficacy Beyond the Gym
Kayla Bonkowski’s CrossFit practice produces these effects. She also notes what the clinical literature addresses separately: the behavioral and self-efficacy components of a consistent training practice. A person who trains regularly is engaged in a daily practice of setting an objective, tolerating discomfort, and observing results. That builds something the research identifies as self-efficacy — the belief, grounded in evidence from one’s own behavior, that effort produces outcomes and that you are capable of sustained effort.
Self-efficacy does not stay in the gym. It transfers. For Kayla Bonkowski, managing graduate school, parenting, and active foster work with dogs in Sterling Heights, the training practice is part of what makes the full schedule sustainable.
Relevance to Clinical Practice
The professional relevance is direct. Hospice and palliative care social work is one of the most emotionally demanding specializations in the field. Burnout is a documented occupational risk. The protective factors most consistently identified in research on clinician wellbeing are regular physical exercise, strong personal support systems, and structured activities that provide a clear psychological break from clinical demands. She has built all three before entering the field.
Dosage and the Caveat
What the research also supports, which rarely makes it into public conversations about exercise and mental health, is the dosage question. Effects are not linear. Exercising once a week produces some benefit; three to five times per week produces meaningfully more. Intensity matters as well — moderate-to-vigorous exercise produces stronger effects than light movement for most of the documented outcomes. That specificity is useful because it means that the recommendation to exercise more can be calibrated. Not all exercise is equivalent. The research tells you which format and which frequency produce the outcomes you are looking for. Kayla Bonkowski trains at the frequency and intensity that the literature supports. That is not coincidence.
The caveat she would offer: exercise does not prevent clinical depression or anxiety in all people, does not replace pharmacological treatment for severe presentations, and does not address systemic determinants of mental health outcomes. It is a specific intervention with documented effects in specific populations, not a universal remedy. Knowing the difference between those two things is part of what a psychology background provides.
She is also clear about what she will not claim. Exercise does not guarantee emotional wellbeing. It does not inoculate a practitioner against the real weight of working with dying patients and grieving families. What it does is provide a biological and behavioral baseline that makes sustained clinical work more sustainable. The difference between a baseline that supports the work and one that does not is often the difference between a social worker who stays in a demanding specialization and one who burns out. Kayla Bonkowski is building the baseline now, before the demands arrive.
More from Kayla Bonkowski: Why CrossFit Is Not a Weight Loss Program and The Case for Combining Psychology and Social Work. Full background at About Kayla Bonkowski.