It's also less strain on the back, which is good for injury prevention, while still working some of the major muscles of the chest and arms. (womenshealthandfitness.com.au)
You don't want isolation of each individual muscle, but integration by using compound exercises that move large muscles of the chest, back and legs. (flippingfifty.com)
Pecs — Abbreviation for pectoral muscles of the chest. (davedreas.com)