Let's make this birthday one to remember.

40 years old (Born on September 11, 1984)

Happy Birthday, William Nelson! You've leaped over hurdles and splashed through water pits with such grace that even gravity applauds your style. Qualifying for the Olympics not once but twice—in 2008 and again in 2012—is no small feat; clearly, you took "chasing dreams" quite literally!

Now as an assistant coach at the University of Colorado, you're inspiring a new generation to hurdle life's obstacles (and steeple barriers) effortlessly. May your birthday be filled with fewer hurdles than usual—and if there are any puddles involved today, may they only appear beneath celebratory beverages. Cheers to another lap around the sun!