It's time. This week you will run 3 kms nonstop. Do not switch to walking. Run as slow as you want but run. I'm pretty sure you can make it to 3 km in less than 20 minutes. Now you have to start believing it too.
I'm not a doctor or even a professional athlete. I'm just a working mother of 3 who found myself a runner and am still in shock. This is just about cheering for healthy people who want to start running but lack motivation. If you have any medical concerns or worries, see a pro.