Building the Shoulders
The Deltoids a.k.a shoulders are probably that one group of muscles that get worked in a lot of exercises (although not to a significant degree as isolating them would). For example, doing the bench press (flat or incline) works the anterior or front delt. Horizontal rowing to chest as in cable or machine rows works the rear delts also. The deltoid muscles comprises of three heads i.e. anterior (front) , lateral (side/middle) and posterior (rear) . If you look at the composition and growth potential of these three muscles on any advanced and competitive bodybuilder whose already in possession of those rounded shoulders you may notice that its the Lateral (middle) debt that brings out the developed and rounded look. The does not mean that the other two shoulder muscles don't have an impact but rather that, focusing on lateral shoulders exercises such as lateral dumbbell/cable/machine raises must be performed with slightly more volume than front and rear shoulder exercise