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If you're training for a marathon, keep this strategy in mind: start slow for the first third of the marathon, in the middle third run at a comfortable pace, and run slightly faster in the last third of the race. This will help your body maintain its strength and power the entire length of the marathon.

If you are a regular runner make sure that you replace your running trainers at least every 500 miles. If you don't replace your trainers when the soles have worn out, you will be running in an unstable trainer which could lead to knee injuries and ankle pain. A worn out shoe sole can also cause the bottoms of your feet to be covered in blisters and hard crusty callouses.