A sore muscle isn’t necessarily one that hasn’t recovered. In fact, short-burst activity, like metabolic sprints, can ease soreness and build stamina by increasing blood flow and boosting delivery of oxygen and nutrients to the muscles. Do three sets of 10- second sprints on a bike, working at an easy pace for two minutes between sets, recommends Carwyn Sharp, Ph.D., C.S.C.S., education director at the NSCA.
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