It's on! Gisele Bundchen and Jimmy Fallon engaged in some fierce competition on Thursday, Sept. 4, when the supermodel stopped by The Tonight Show

The world's highest-paid supermodel, 34, caught up with the talk show host, 39, in promotion of her new campaign with Under Armour. While she was chatting with Fallon, he brought out a few of her photos from Instagram, commenting on the beautiful, adventurous life that she leads.

"You do things that would never happen to me in my entire life," Fallon marveled. "I live vicariously through your Instagram photos."

Whipping out a shot of Bundchen doing a headstand in a bikini on the beach, Fallon commented, "That would never happen to me!"

The gorgeous model refuted his statement, saying, "I can teach you that, I can teach you that."

"No, you can't teach me that," Fallon said. 

After Bundchen promised that she and Fallon were going to practice the yoga move, the funnyman's audience encouraged the pair to give the headstand a shot while filming Tonight. Tom Brady's wife considered the proposal, before changing her mind due to her outfit. 

Wearing a tight, strapless top and high-waisted pants, Bundchen settled on an alternative. "I'm going to teach you something easier today… today, how about we do a plank? I challenge you to do a plank!" 

Watch what happens when Fallon accepts Bundchen's challenge in the video above!