May 19 2016
Yes, even crazy ultrarunners make mega training mistakes.
Most runners never run all out in training. That’s too bad, because sprinting is fun(!) and beneficial, even for marathoners. The downside of sprinting is that it comes with a risk of hamstring strains. But you can minimize that risk by sprinting uphill on a treadmill where the environment is controlled. The best time to incorporate power sprints into your training is at the end of an easy run.
Challenge Level: Moderate
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