Professional freerunner Egor Minasov has posted a video of what has to be the most extreme ab exercise of all time: crunches while hanging off a tower in Dubai Marina.

The 23-year-old Russian athlete posted this video online on Monday. Do not every try any of this yourself readers, ever. And we mean that:

We will repeat again: never ever do your ab workout on the ledge of a building (or tumble and flip on that ledge either). Or in fact stand on the ledge at all.

Because remember, Minasov is a professional athlete – here’s a video that showcases just how athletic he is:

More stomach churning Dubai stuff…
– Freerunner takes on the Sofitel hotel
– Six of Dubai’s most extreme stunts
– Dream Jump
– Spiderman in Dubai
– Car-kour stunts
– Dancing skydivers
– Jetman Dubai

– Warning: Do not try this at home.