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Lactic Acid. It's a runner's worst enemy. It's that pain you get in your legs when you are nearing the end of your race. Lactic Acid is a bi-product of your muscles burning energy to keep you moving forward, and making your legs feel like anchors in the process.
One way to train your legs to better deal with the problem is through interval training. Interval training consists of running a certain distance or time, and then repeating it multiple times, with a predetermined amount of rest in between. It is a great way to become a better runner, and lower your race times!