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I am not a runner, I have an allergy to physical activity lol (really I'm just super lazy). However in my last year of high school, in my PE/ Health class we went through all the different types of training and how the wrong one can really set your progress back. First of all we were taught to know your goal. So you want to be able to run 2 miles in 15 mins like in high school. HOw long ago was high school for you?? Realistically you cannot expect your body to get used to doing something it hasnt done in a while.
Have you been doing any other exercise since high school to keep your fitness levels up? If not, then thats what you need to focus on first. From what I can gather your goal to run 2 miles in 15mins is a long term goal (not five years off, but not next week either). So in order to get there set yourself some short term goals. Maybe start with just powerwalking first then gradually as your fitness level builds, then you can start on the jogging.
Or another thing we were taught was progressive overload. The theory behind this is that as your body adjusts to the increase in training, you start doing a bit more, pushing yourself a bit harder. If you want more info on that, google "progressive overload" and there will be heaps more info for you.
Good Luck!
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