Add a spin class, bike some hills, or climb some stairs once or twice a week, especially if your muscles are sore from running. These non-running workouts will boost your level of fitness and add enough extra leg strength to make a difference in your running times. One of my favorites is 4 x 2 min hill repeats on my mountain bike. I run in the morning and do this 30 minute intense workout in the evening. Hard work with no extra pounding!
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