Let's make this birthday one to remember.

49 years old (Born on July 12, 1975)

Happy Birthday, Kai Greene! To the man whose arms once earned him "Biggest Arms in the Universe"—a title so epic even aliens envy your biceps. Your back-to-back Arnold Classic victories in 2009 and 2010 proved that lightning does strike twice, especially when flexing is involved.

From dominating Flex magazine covers to inspiring millions with your legendary posing routines, you've shown us all how bodybuilding meets artistry (and occasionally gravity-defying hairstyles). May this birthday bring you as much joy as leg day brings pain—and remember: age is just a number; reps are forever!

Keep flexing strong and celebrating stronger!