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By regularly exercising 30-40 minutes several times a week for about six months, runners
(or walkers) seem to develop an addiction to the relaxed feeling that comes at the
end of the run. It is suspected that this is caused by the beta endorphin hormones which
lock into your mid-brain area and produce a subtle tranquilizing effect. The body
and mind begin to anticipate this after-exercise effect and miss it when you don't exercise.
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