If you’re not a big Instagram user, you might ask “Sean Who?” – but with more than 1 million followers on Instagram, 20-year-old Sean O’Donnell is a big social media star.

Your next question might be – why should I care? Oh you will care, once you see his abs. There you go:

1. The thing with the shirt

2. Just sitting there

3. Nice arms, too!

4. The mandatory Calvins shot

I, think about my next meal in #mycalvins

A post shared by Sean O'Donnell (@theseanodonnell) on

5. Pool time

6. Some more fun at the pool

Not a bad way to start off the week☀️

A post shared by Sean O'Donnell (@theseanodonnell) on

7. Short shorts

8. Look, a car!

9. His captions are amusing

10. You have to work for your abs

11. Doing that thing with the shirt again

12. Over and out