What are the benefits of supplementing your running with just more running? Well if you are able to run most of your miles in singles(only running one run per day), and you have time available during another part of your day, then you should consider doubling with a light easy run. Say you run 8 miles in the morning. In the evening you can go out for a light and easy 3 miles. Light and easy runs help to disperse the lactic acid from the harder run you completed in the morning. They will loosen you out and you can get a good stretch in after them so that the following morning you will not wake up as tight as you would have if you had done no second run at all. But the big benefits of second runs are the following:
1)An increase in the size and number of mitochondria. Mitochondria help remove lactic acid that accumulates when running.
2)An increase in the capillarization of the muscle fibers
3)The enzyme activity within the mitochondria4.
4) Light and easy running also trains fast twitch muscle fibers so they have greater aerobic capacity than normal
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