High volume AND high intensity? And that will avoid overtraining? O rly?
The amount of exercises someone does is not indicative of overtraining or not. Total amount of work done is.
For certain things more exercises is necessary. For somehting like the pecs, Id say 2 is on the skimpy side, even for a beginner. The pecs have 2 heads, its best to hit the pecs from multiple angles.