For my birthday this year I decided to go with my Crossfit total since I was long overdue on that. I got a lifetime PR on the back squats. Later, I did a brutal sled and strong man sandbag WOD in the heat.
For the past several birthdays, I have been doing challenges when it comes up. I had been doing burpee pull-ups because that was more challenging than plain burpees. This year, I did body weight back squats unbroken.