The Blunt Talk actor chatted with ET on the Golden Globes red carpet Sunday about a recent photo he posted on Instagram that made the Internet go wild.
The beach snapshot shows a shirtless Stewart with his toned tummy and arms on full display, although he admits that he thought people would be more focused on his outfit.
“It wasn’t the abs I was thinking of showing,” he explained to ET. “The pink shorts, the pink beach shoes and the pink cocktail I had in one hand -- I was color coordinated and that was what it was really about.”
So what’s the secret behind killer abs at any age?
“Pushups. It’s that simple,” Stewart revealed.
Stewart wasn’t the only celeb to get candid with the ET cameras! Watch the video below to see Leonardo DiCaprio explain his hilarious reaction to Lady Gaga’s Golden Globe win.