WEIGH IT UP

Runner's World (UK) - - WARM-UPS -

You may think light means fast but when body weight is too low, your risk of stress frac­tures in­creases. In a three-year study4 of fe­male run­ners, re­searchers found that a body mass in­dex (BMI) of 19 or un­der was as­so­ci­ated with a higher preva­lence of stress frac­tures. Their in­juries also took a month longer to heal than in women with a BMI above 19. Lead au­thor Dr Ti­mothy Miller sug­gests fe­male ath­letes main­tain a body mass in­dex of 20-24.

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