Jealous of My Kids' Lung Power!

So, I'm running a LOT more than them...and every time I run with one of them, I'm simply just jealous of the fact that my breathing is so much harder than theirs.  So not fair!  My son can now talk constantly running for an entire mile while educating me on greek mythology (he absolutely loves the subject) while I'm huffing and puffing over here.  Oh, the joys of youth!