Lie chest down on elevated bench. Grasp dumbbells below.
Pull dumbbells to sides until upper arm is just beyond horizontal or height of back. Return until arms are extended and shoulders are stretched downward. Repeat.
Bench should be high enough to allow shoulders to stretch forward without dumbbells hitting floor. Exercise can also be performed on Lying Row Apparatus or Incline Bench adjusted to height close to horizontal yet high enough to permit full range of motion at lowest range of motion.