Originally Posted by thai_fighter
When you isolate a muscle your force that muscle to do all the work it's self without relying on other muscle to help it. The benifit is that you develope more power more quickly in that muscle in which turns more strength.
I disagree with your views on isolation, and the whole point of functional strength is
using a lot of muscles at one time, hence them being compound movements. Also, a push/pull/squat routine is a common PL'ing routine, not one for bodybuilders. Bodybuilders train for mass, symmetry, and aesthetics, which is usually not the same goal as fighters/athletes.