When Conor McGregor steps inside the ring to fight Floyd Mayweather in a boxing match on Aug. 26, he will have already seen himself knocking out Mayweather every day for two months. And that’s because of what can be seen in the background of this Instagram post from the UFC lightweight champion: Yes, McGregor (21-3 MMA, 9-1 UFC) is training for Mayweather (49-0 boxing) every day with the backdrop of a giant mural depicting him knocking Mayweather silly with a straight left. Here’s a better and complete look of the artwork that adorns McGregor’s gym in Dublin, courtesy of an Instagram post from the company that made it: So how did this come about? Besides the fact that something this bold and brash is what we’ve come to expect from “The Notorious.” Turns out it was a last-minute request from McGregor’s coach, John Kavanaugh, to help his fighter mentally prepare. Via Yahoo.com : We, SUBSET, are a Multidisciplinary Artist Collective with interests ranging from Art, Marketing​,​ Music and Film to ​Finance, Hospitality and Clothing.