Tuck both elbows into your sides for power
After seeing on video that his elbow had drifted far from his body - leaving him, by his own account, with no power at all - Trevino recalls Ben Hogan's Ed Sullivan Show simplification: take both elbows, put them into your sides, grab the club and swing. The point is connection: an elbow flying away from the body costs power, so keeping the arms tucked to the body restores it.
Channel: GOLF's Subpar
Watch official source at 45:29Why this context matters
Trevino recalls Hogan's tip right after seeing his own elbow fly far from his body with no power.