The idea is to step up on to the "box" with one foot and swing the other over it.
The new trend, aptly termed the "Invisible Box Challenge", has been around for a while, but has only recently turned into a full-fledged internet obsession.
"People around my school just started retweeting it and I thought it would only go as far as throughout my school, but through the night it just get going, my phone kept blowing up", Olivar said, after explaining the trick to the trick. It's actually kind of challenging keeping it there.
However, many Internet users have been left dazed and confused wondering how the trick actually works.
Last month, Men's Health fitness editor Ebenezer Samuel broke the move down one leg at a time.
'"Very explosive hip flexor, abdominal and glute strength is what is driving the leg up and over the box".
"All [the] hip stabilisers on the right side are firing on overtime to hold that hip in position", he said. "You'll notice his body rotates toward the leg on the step as well; there's a ton of oblique and ab stability maintaining that position". It's basic mime, but it's impressive enough to have inspired thousands of less agile challengers to share their own attempts (warning: you may fall on your face). Star Trek actor William Shatner tweeted about the challenge, saying "And BTW don't ask me to do the invisible box challenge; the answer is no".