UFC Fighter Chad Mendes -- Watch Me Turn This Push-Up ... INTO A BACKFLIP!

We've all seen athletes do regular push ups. And clapping push ups. And diamond push-ups ... but have you ever seen anyone do BACKFLIP PUSH-UPS?!

Meet UFC fighter Chad Mendes ... who showed off his acrobatic workout skills at a media event for his upcoming fight against Nik Lentz at "UFC on Fox 9" in December.

For good measure, Chad also knocks out a "clapping behind the back" push-up.

Last time we saw anyone pull off push-ups like these ... was right before we turned off "Don't Mess with the Zohan."