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How to run for longer
Take time to warm up and stretch out.
It can be tempting to just get on with the running part of running, but properly preparing your body will pay dividends in your results. A proper warm up can also reduce your chance for progress-derailing injuries, such as a pulled hamstring.
Warm up your muscles for 10-15 minutes before beginning your workout proper. Start by walking and gradually picking up the pace until you reach a full run.