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'A big problem with long-distance runners,' according to Dr. Metzl, 'is that many of them do plenty of running but not much else. (I'm running Boston, and I plead guilty as charged.) That puts a limit on how far they can run pain-free.' Dr. Metzl recommends a strength workout that involves quick explosive repetitions, including squats, planks, sit-ups, push-ups and leg lifts but comparatively little weight work.
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