TODAY'S A DAY FOR SOME R&R: Cross-train for 20 minutes then lift some weights. Cross-training is any activity that allows the muscles you use in your main sport (in this case, your running muscles) to recover, while still producing a training effect for that sport. Deep-water running and cycling are the best cross-training activities for running. If you haven't lifted weights before, get help from a qualified personal trainer or staff person at your gym.
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