Lateral lifts are an excellent exercise because they tone multiple parts of the body at the same time, saving you workout time if you're busy and offering excellent results. By lifting your arms out laterally from resting position while holding a weight, you're strengthening your biceps, triceps, forearms, shoulders, and pectorals. That's a pretty big result for such a simple move.
If you're interested in adding this effective and quick exercise to your daily routine, check out this fitness video for the how-to on standing dumbbell lateral lifts.
When you work shoulders you have to hit them with two different types of exercises. You must do both press type and pull (or lateral) type movements.
Presses work your medial and your front head while pulls / laterals work your rear shoulders more.