Chapter 1: The Rooftop Forge Jimmy Chilla, 32, ruled Austin’s fitness underground from his rooftop gym, Chilla’s Sky Forge, a raw, open-air fortress atop a weathered warehouse in East Austin. Steel squat racks, barbells, and battle ropes gleamed under flickering neon tubes, the city’s skyline pulsing below, stars slicing through the humid night. At 6’2”, 190...