21K Run Trainer helps you enhance your strength, endurance, and stamina, while training for your 21k run. It will help you become the runner you’ve always wanted to be! This is the easiest, most comprehensive and most successful half marathon training plan for you to train for your first 21K.

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I've used the Nike workout app and it's really helpful in getting you through a workout. I imagine this is much the same. Anyone ever used a run-training app before?
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