Most people have no clue what integrated functional training is, including those in this thread (no offense guys). So if you're not doing it, most people aren't going to be the wiser. There's no standard definition but, functional training, or functional movement, is the ability to move and respond to daily activities without restriction. Activities like playing with our kids, carrying groceries, playing softball, or stepping off a curb are functional tasks we should be able to do without injury or pain. In nearly everything you do, from lifting a child to vacuuming the house to lifting the groceries, your core is involved. Functional training is a strength training option that focuses on exercises that can be transferred from in the gym to activities of daily work, sport or life to ultimately enhance the quality of life.
Simple and effective “toys” are things such as stability balls, medicine balls, foam rollers, Aeromats, gel pads, rocker boards, Bosu balls, bands and tubing. Because of these items being unstable, you are constantly challenged to maintain posture by contracting the abdominals, lower back and gluteal muscles. While doing a multitude of different exercises, the trunk musculature works simultaneously to balance and stabilize the body.
Is it a good protocol for bodybuilding? Of course not entirely, but much of it can be incorporated into a regime with noticeable gains/improvements. Getting all the body's systems working in sync with each other builds a functional body.