This boasting has gone on long enough. You are a superhero, and not just any superhero.

You're Superman.

He was in Justice League headquarters, where he had met up with some super heroines in the lounge after their retreat. Some of the women had completed a mission which saved Themyscira, so as a reward, A respected trainer from the island of women met in secrecy with Wonder Woman, Hawkgirl, Black Canary, Huntress, Vixen, and Supergirl to teach them strength building techniques no secretive Diana had not heard of them before.

The women had been gone a long time, and now that they had returned, they had much confidence in their new abilities. Too much.

Supergirl flexed her biceps "I swear, I could take on any of the guys we fought before with one hand."
Huntress laughed "Yeah, those guys do seem like pansies now."
Vixen pondered "You know, I think we may just get bored here now, who could stand up to us?"
Superman went into sage mode. "Don't get too cocky, these villains are plenty dangerous."

Hawkgirl spoke up "I don't know, Bruce, we are just a hell of a lot stronger now."
Black Canary crossed her legs and smirked. "Yeah, I can't wait to see Green Arrow's face next time we spar."
Supergirl had an idea. "Oh Vixen, if we ever need a real challenge, we can all get together and try to fight Diana."
Vixen shuddered "Now that's just too much challenge for my tastes."

Apparently Diana had taken shockingly well to the training, she could easily beat any of the other girls.

Supergirl hatched another idea "Oh wow Diana, I think you might just be stronger than Clark now."
The girls made a roaring sound at the challenge.
Superman humored her and laughed loudly. "Just maybe."

Wonder woman had yet to beat him when he was giving his all.

Speaking for the first time Diana chuckled and pushed back her mane of silky hair. "Oh hush, no need for that."

But Clark saw an opportunity to instill some reality into these girls.

"No, no, Diana, how about an arm wrestling contest?"