Position yourself on a free standing incline bench, lying on it with your back flat on the bench.
Have your spotter hand you two dumbbells, one for each hand.
Grip each dumbbell with your palms facing inward toward one another.
When you begin this movement, you want your arms to be stretched out wide to your sides with your elbows slightly bent and your palms facing inward, toward one another. At the peak of the movement, really squeeze your pecs together for a one-count.
When returning to the start position, be sure to lower the dumbbells in a slow and controlled fashion.
Repeat this movement for as many repetitions as you can until failure.
Don't push the weight out over your stomach or behind your head. Keep it vertical.