They may have entertained thousands in London on Friday night ahead of their bout next month, but across the Atlantic not all the fighting build-up is to Floyd Mayweather versus Conor McGregor.
Over in America, Manchester United are currently enduring double sessions in pre-season ahead of the new campaign.
However, two of their stars managed to find some time away from the hard work to have a bit of fun in and around their training.
Anthony Martial and Joel Pereira swapped football for boxing as they engaged in a playful mock fight on Friday.