The DB squat is an excellent exercise to teach proper squat technique.  It is also an effective exercise by itself or can be used as a warm-up before heavier lifting.

• Place feet about hip width apart.
• Hold light DB's (5-10lbs) on top of the thighs.
• Think about sticking the butt and chest out.
• Hold this tight position.

• Raise arms in front of the body as you squat.
• Maintain tight upper body with body slightly forward.
• Dumbbells should rise at the same rate that the body descends.
• Try to get thighs parallel to the floor.
• You should be able to sit back on the heels.  This will work the quads and take the pressure off the knees.