What do Gladiator, Self-Efficacy, and Ability have in common?

Gladiator is one of many fictional characters of Marvel Comics. But what makes him stand out from the rest is his ability to instantly become stronger and stronger the more confident he becomes.

Gladiator is capable of becoming so strong that he can shatter a planet with a single blow, be invulnerable to a supernova explosion at close distances, fly a hundred times faster than the speed of light, shoot lasers out of his eyes hotter than a star, and freeze things by blowing on them.

Though not to the extent of Gladiator, humans display more ability the more confident they become. Researcher Albert Bandura coined this phenomenon self-efficacy.

Self-efficacy is the extent that you believe you can do something, directly affecting your ability to do it. Like Gladiator, the more you believe you can do something, the more ability you have to do it.

Be like Gladiator. Say "I can do it" (self-efficacy), thereby heightening your confidence that you can do it, thereby heightening your actual ability to do it!