Jason, with another feat of strength proposed, couldn't pass this up.

He just wanted to stroke his own ego-

I'm lying. Jason wanted to impress you. So, after Frank "challenged" him to a pushup contest(Jason bribed him to do so), he took it one step further and beckoned you onto his back with a flick of his wrist.

"Come on," Jason let a small smirk tug at his lips. "I can handle it."