Scientists in Denmark have been studying over 1,000

　　joggers and non­joggers for 12 years. The death rates from the

　　sample group indicate that people who jog at a moderate pace

　　two or three times a week for less than two and a half hours in

　　total are least likely to die. The best speed to jog at was found

　　to be about 5 miles per hour. The research suggests that

　　people who jog more than three times a week or at higher

　　speeds of over 7 mph die at the same rate as non­joggers.

　　The

　　scientists think that this is because strenuous exercise causes

　　structural changes to the heart and arteries (动脉).Over time, this can cause serious injuries.

　　Peter Schnohr, a researcher in Copenhagen, said,

　　“If

　　your goal is to decrease risk of death and improve life

　　expectancy, jogging a few times a week at a moderate pace is

　　a good strategy. Anything more is not just unnecessary,

　　and it

　　may be harmful.”

　　The implications of this are that moderate forms of exercise such as t'ai chi, yoga and brisk walking may be better for us than “iron man” events, triathlons and long­distance running and cycling. According to Jacob Louis Marott, another researcher involved in the study, “You don't actually

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