RUN FOUR 1-MILE REPEATS: These longer repeats are called "strength intervals" because they build leg strength. If you're bored with the track, you can do today's workout on a measured bike path or dirt road. Jog to warm up, then run four one-mile repeats FASTER than your 10K pace. Walk/jog one lap (1/4 mile) to recover between repeats. When you're finished, jog to cool down.
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