Short answers, pulled from the story.
The concept of the superpower emerged in American comics and pulp fiction during the 1930s. This era marked a shift where ordinary people began to possess abilities far beyond normal human limits.
Ben Tennyson touches an alien device known as the Omnitrix to transform into a four-armed creature called Four Arms. His muscles bulge and his skin turns red as he gains immense physical power from this transformation.
Two brothers attempt to restore their bodies by drawing energy from the earth itself to transmute matter into new forms. They utilize alchemy to perform these transformations within the story of Fullmetal Alchemist.
Power Rangers adapted the Super Sentai format for Western audiences starting in 1993. Kamen Rider follows a similar pattern with masked riders battling evil forces while actors perform stunts in suits.
James Kakalios wrote a book titled The Physics of Superheroes to analyze comic book feats. He calculated whether Spider-Man could actually swing between buildings without breaking his wrists.