If you’re a living human with a working Internet connection, you heard about the 10 Year Challenge. You probably participated in it, too. All week, people have been going on social media and sharing side-by-side photos of themselves from 2009 and from 2019, to show how the past decade has changed them.

It’s a fun way to reflect on personal growth, but some folks out there changed a lot more than others. Here are 15 of the most dramatic transformations. (via Bored Panda)

1. Swole

Photo Credit: juanbetancourtt

2. First selfie vs. now selfie

Photo Credit: piperrockelle

3. “To be honest, most of the difference is mastering my selfie angles.”

Photo Credit: polly.powell

4. Lots of people looked back on their transition.

Photo Credit: patti_longlegs

5. Hand placement

Photo Credit: theellenshow

6. Still shouty

Photo Credit: @GordonRamsay

7. Still together 10 years later

Photo Credit: staceya2810

8. The kids are older, but it’s still a mad house.

Photo Credit: @claremackint0sh

9. You’re never too old to annoy your siblings.

Photo Credit: pratiksehajpal

10. Celebrating sobriety.

Photo Credit: tommy.dorfman

11. Started out with nothing

Photo Credit: @CassperNyovest

12. Long hair vs. short hair

Photo Credit: pinargoktas_

13. Where the Ruffalo roam

Photo Credit: markruffalo

14. Dreaming of facial hair

Photo Credit: @_zaryabmalik

15. Amazing story

Photo Credit: @Amani_Art

h/t: Bored Panda