This was the single biggest revolution, bruh! In the late 1940s, pioneers like Bob Simmons and later Hobie Alter started shaping lightweight foam cores wrapped in fiberglass and resin. This made boards infinitely lighter, more buoyant, and way easier to maneuver. Suddenly, average joes could learn, and hot-dogging became possible. This birthed the modern shortboard and allowed for experimentation with fins and rocker. It basically democratized surfing and unleashed a new era of performance.