I’m slow­ing as I age (as ev­ery­one does). Is it be­cause my stride’s get­ting shorter, or my turnover’s slower?

Runner's World South Africa - - Personal Best -

Your stride is prob­a­bly short­en­ing as your mus­cles lose strength and power – but that’s not the only fac­tor be­hind the slow­down. Car­dio­vas­cu­lar fit­ness, flex­i­bil­ity, and range of mo­tion also de­cline nat­u­rally with age (sorry!). To cut your losses, con­sider fo­cus­ing more on in­ten­sity than mileage: work­outs that al­ter­nate be­tween short, hard-ef­fort bursts and re­cov­ery pe­ri­ods help build power in the calves, which seem to lose func­tion sooner with age than other mus­cles and are cru­cial to main­tain­ing speed. Try twice­weekly short-in­ter­val or hill ses­sions at higher speeds – if you’re able to do them without ag­gra­vat­ing any injuries. – Dr Paul DeVita, ki­ne­si­ol­ogy pro­fes­sor at East Carolina Univer­sity and re­cent past pres­i­dent of the Amer­i­can So­ci­ety of Biome­chan­ics

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