If you plan to run three miles and halfway into the run you feel a twinge in your hamstring, don’t push through the pain. Cut your run short. While you didn’t run three miles, you did go for your run—and you haven’t risked injuring yourself. Even though there will always be small setbacks, as long as you don’t miss your scheduled runs, you will get in better shape over the long term. So if you do feel that twinge and let discretion be the better part of valor, you get to feel twice as good about yourself: You didn’t miss your workout and you made a smart short-term decision that supports your
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