CROSS-TRAIN FOR 20 MINUTES, THEN LIFT 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. The best cross-training activities for running are deep water running, cycling, stair-climbing machines, stationary bicycles, rowing machines, and swimming. If you haven't lifted weights before, get help from a qualified personal trainer or staff person at your gym.
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