Lie down on an incline bench and raise the dumbbells above your upper chest with your palms facing in. Your arms should be slightly bent. This is your starting position.
Lower the dumbbells until your upper arms are slightly-past-parallel to the floor. Then, press the dumbbells back up to the original starting position. Repeat this movement for the desired or prescribed number of repetitions.
Perform this exercise in a smooth and fluid motion
Don't lock out your arms at the top
Don't bang the dumbbells into each other at the top of the movement
SPECIAL NOTES & LEVEL of DIFFICULTY VARIATIONS
To increase the level of difficulty, slow down the movement or use heavier dumbbells.
This exercise is a variation on the classic incline. It's good for those who have hit a plateau and need to add some variety to an already existing chest exercise program.
The nuanced grip with this exercise shifts how the weight is distributed onto your chest muscles and therefore "hits" them from a slightly different angle which is great. Variation makes your muscles confused; confusion means your muscles will grow more in order to adjust to the new "stress" they are facing.
Thus, keep this exercise in your hip pocket for those times when you need to add some variety into the mix.