Internet - This woman had two athletes plus more than 40,000 Reddit users going nuts with a strange body morphing trick.

A brief clip posted on Friday shows a toned young woman at a gym showing some other athletes how she can make her stomach disappear.

With a simple exhale, the woman pulls in her stomach so much that it seems as if all the organs under her ribs have instantly vanished.

One of the horrified men stuck his index finger into the empty space in amazement, the other's jaw dropped. The freaky sight clearly was not what they were expecting.

The two men weren't alone in their reaction, as the video took less than a day to become a viral hit on Reddit.

According to Unilad, it's perfectly possible to tuck your stomach in like that, but you'll need to have extremely well-trained abs to do it. Other Reddit commenters pointed out that its an old body builder's trick.

If you're not too put off by the sight of your ribs, this is actually a pretty good workout for your abs: pulling in the stomach after taking a big breath and exhaling is a lot harder than it sounds.

Doing this for 10 minutes at a time can get some impressive results.