Well done! With the benefit of hindsight, my advice is don't worry about speed at all at this stage. You will be better off building your aerobic capacity by taking it slow and steady while increasing your time/distance. With repetition, you'll find that your body will deliver the same pace but at a lower heart rate. And you need to keep your heart rate in the aerobic zone because that's what burns fat. Good luck and stick with it.
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