Stand with a dumbbell in each hand at the shoulders with the palms facing approximately forward. Press one side into a fully locked out, stable overhead position with the upper back tight. As you’re lowering under control to the starting position, begin pressing the other side up. Continue alternating for the prescribed reps.
 
Purpose
The alternating dumbbell press is a simple way to strengthen the shoulders, upper back and arms and help achieve or maintain symmetry in strength between the two sides. The single-arm press generally makes it easier for those with limited mobility.
 
Programming
Generally sets of 6-15 reps/arm are appropriate.