This is a great chest exercise for hypertrophy if you have good motor control. Start with the incline bench set at about 45 degrees, higher than you would normally use for incline bench presses or flyes.
With a slight bend in the elbows, initiate the movement by contracting your pecs. Really try to "open up" the chest.
Don't bring the dumbbells straight down; that will just hit your shoulders. Notice the natural arcing motion of the arms. The dumbbells start at the sides and should stop above the upper chest.
Look around your gym. Most trainees lack the calf thickness to suspend a pair of double striped knee socks, let along balance out the size and symmetry of the lower leg. Now look in the mirror. Are you one of them?
Slow down there, Hoss; you can't start pulling heavy weights from the get-go. Let us show you the proper progressions to make your deadlift truly worthwhile.