LOS ANGELES—Wes Orth Jr., the man considered to be the standard-bearer for a new breed of strong and aloof impersonal trainers, could not care less about the workout regimen of his clients, many of whom say his indifference powers their adrenaline-charged, spite-filled workouts. "Sure, wave those dumbbells around, whatever," Orth said during a typically hands-off training session at his L.A. gym this weekend. "Or just sit on your fat ass—I get paid either way." Orth's newest workout video, Wes Orth Jr. Doesn't Give Two Damp Shits If You Live Strong Or Die Young, debuted at the top of the Amazon DVD sales charts on Monday.