To increase their muscle mass and definition, bodybuilders tend to do high volume work and isolation training for the smaller muscles. (fitnessandpower.com)
The more muscle mass you have, the more isolation training you're allowed to do. (fitnessandpower.com)
Together, set up a workout where you perform your typical isolation training, such as chest day, but change one part of the workout to include more function. (weckmethod.com)