There is evidence to show that regular exercise and sport are associated not only with physical fitness but also with a lower incidence of depression. Scientists have been conducting research to discover why people who exercise on a regular (46)___________ feequently report that physical activity improves their mood, making them feel calmer and (47)_____ ________ apprehensive. Explanations (48)_____________ to precisely why it is mood-enhancing(49) ___________, with some reseachers arguing that exercise may be acting as a diversion(50) __________ negative thoughts, while others claim that it is developing a(51) ___________ of a new skill that is the most significant factor. In addition, it is undeniably true that the social(52) __________ which participation in sporting activities often involves also plays its part in mood enhancement.

(53)___________ the reasons may be why vigorous activity should have(54) __________ a powerful effect on how people feel, it has been shown that exercise is as potent as any medication(55)___________ depression.

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