Let's make this birthday one to remember.

40 years old (Born on December 28, 1984)

Happy Birthday, Duane Solomon! You're the only guy we know who can run 800 meters faster than most of us can decide what to order for lunch. Your incredible fourth-place finish at the 2012 Olympics still has us cheering—and slightly out of breath just thinking about it.

And let's not forget your epic victory at the 2013 U.S. Outdoor Championships—proof that you're aging like fine wine (or maybe a finely tuned stopwatch). May your birthday be filled with laughter, cake, and absolutely no interval training whatsoever. Keep running circles around everyone else; we'll keep applauding from our couches!