Here's the thing- I do remember not being able to run for a minute. Five was hard. But... I was also a planet, and I sure as hell didn't think I should be proud of running a mile. I'm not a runner. I get bored super easily. I do it because I needed to regain cardio function and interval training is fun to me. I run 3 miles a day and I'm working on my 8 minute mile. Still, it's nothing to be proud of... it's just a fact.  What kills me about all this is the need for public backpats. Use whatever milestones work for you, but don't expect a standing ovation when you pass something that is average at best.