When the topic and context is health and treatment, would the expression physical betterment be broadly understood as one or any combination of the below?
1) betterment of one's health condition
2) one's health improving
3) remission of disease
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It would seem to refer to the improvement of one's physical health. Most likely this is one's general health (cardio, bowel) rather than the cure of a particular disease. It would probably be used in contrast to "Psychological betterment".
Improvements in mental health in response to physical betterment.
A headline like this would probably be about improving mental conditions like anxiety or depression by going to the gym regularly and eating more vegetables.