My "I can run forever" speed is more like 13 minute miles now, up from 14 minute miles. And it took me a long time to be able to motor for a 5k at a 14 minute

My "I can run forever" speed is more like 13 minute miles now, up from 14 minute miles. And it took me a long time to be able to motor for a 5k at a 14 minute/mile pace and not struggle mentally or physically at all. And I'm in the not-obese-but-out-of-shape category.