In a promotional video for the Sapien Center, a private health club in East Austin, shirtless men vault over picnic tables and lasers strobe to the beat of Diplo-esque techno. A woman swings from a ribbon of fabric like a circus acrobat. There’s slow-motion footage of women shrieking and laughing as they splash around in a cold-plunge tub, and several raw eggs are cracked directly into enthusiastic mouths. A man performs a rap about raw milk while drinking it straight from a gallon jug. And at the center of it all is Brian Sanders, the 41-year-old founder of the Sapien Center and self-described “voice of reason” in the raw-milk revival. A soft-spoken California-to-Austin transplant, Sanders exhibits a wry self-awareness—the promotional video in question is built around…