'Addiction' to exercising is currently classed as a 'behavioural addiction' whereby a person becomes 'hooked' on the euphoria and pleasure that it provides (in some individuals).
It's known that heavy exercise can generate the release of hormones known as endorphins - which play a major role in the body's inhibitory response to pain, and which have effects that are in some ways analogous to opiate drugs.
As of 2016, the mechanisms involved in the development of an exercise addiction, associated with the transition from healthy committed exercise to compulsive exercise, are unknown.
Source : Wikipedia
Due to the lack of a precise definition, it's not possible to give a figure for its prevalence in society. Some studies have put the figure as high as 40% for regular gym members.
Further technical information : Int J Environ Res Public Health.8(10): 4069โ4081.
Also see :
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