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Justin Bieber BOXING WITH MAYWEATHER ... No Shirt (Of Course)

10/17/2014 6:31 AM PDT

Justin Bieber -- BOXING WITH MAYWEATHER ... No Shirt (Of Course)

Justin Bieber is gonna EAT LIGHTNING AND CRAP THUNDER ... 'cause he's now training to box with the greatest fighter alive -- Floyd Mayweather, Jr.

Bieber and Floyd threw on the gloves at the legendary Ten Goose boxing gym in Van Nuys, CA -- where some pretty big fighters have trained ... guys like Sugar Shane Mosely, Andre Berto and David Tua. 

Sporting a pair of L.A. Clippers shorts, Bieber worked on his jab ... and moving around ring -- making sure to document every single second on his Shots page. 

Bieber also hit the speed bag -- but curiously, there was no video of that ... just a pic. 

So, will Bieber ever get in the ring and actually fight someone???

We can only hope.
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