Gaining a Pound of Strength Every Minute, I Punch My Way Through the Apocalypse

[Aquatic-beast apocalypse + ruthless decisiveness + brutal action + System + massive muscles + overwhelming personal strength + pure wish fulfillment] Nuclear wastewater flooded inland, marine beasts mutated, and the apocalypse began. Jiang Xuan had been struggling to survive amid mountains of corpses, with nowhere left to turn. Then he was reborn fifteen years in the past and activated a combat-focused physical enhancement System. His strength increased by half a kilogram every minute, and he could gain energy and level up by devouring anything! Knowing the apocalypse would arrive in just half a month, he began a routine of eating and training like a madman every day. All his friends and relatives thought he'd lost his mind. A week later, Jiang Xuan announced online that he could run a hundred meters in under eight seconds. Everyone thought he was just chasing attention. Two weeks later, Jiang Xuan posted a video deadlifting a thousand kilograms with one hand. Everyone thought he was crazy and faking it on purpose. Half a month later, the apocalypse arrived. When people saw this bare-chested young man, the muscles on his back twisted into a grotesque, demon-like visage, punch a three-meter-tall lobster monster that was impervious to bullets and blow it to pieces, the entire internet exploded! From that moment on, the mutated seafood in every ocean faced its darkest hour. The iron-shelled crab cried out, “How is this guy's defense even stronger than mine, and his strength greater too?” The two-headed octopus wailed, “I'm supposed to be lord of the ocean, yet he blew me up with one punch. Can you believe it?” The six-finned tuna begged, “Good heavens! Big brother, don't come near me. I'll gladly become your food. Just spare my life and put that iron fist away!” That day, countless deep-sea beasts learned what it meant to live in fear of a muscle-bound powerhouse!