The former One Direction star, 28, revealed his muscular six pack and tattooed arm, as he sent temperatures soaring in just a pair of black tracksuit bottoms.
The singer, 28, admitted that he had a lot to drink on the night of his now-famous interview with Good Morning Britain where he defended his pal Will, 53, for slapping Chris Rock.
The former SAS star, who met the singer in 2019 when they filmed TV special Straight Talking together, joked he mimicked about five different accents during the viral chat.