The pec minor is a thin, flat muscle about equal in size to your biceps muscles. When you build up the pec minor, it can contribute some serious thickness to your chest.
The great upper-chest development of swimmers is due to the activation of the pec minor, which is responsible for half of the freestyle stroke.
Most chest exercises stress the pec major as a prime mover and the pec minor as a stabilizer. Very few exercises target the pec minor specifically as prime mover.
The best exercise to target the pec minor is the LaLanne push-up (aka Chinese push up) with a narrow hand placement. The LaLanne push up with a narrow hand placement targets the pec minor, which in turn will "push out" the pec major, making the chest look thicker.
For more bodybuilding exercises check out Strength and Physique: High Tension Exercises for Muscular Growth
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