Working out is a product of all the sum of it's parts. It's about learning. It's about pushing yourself. It's about variation. It's about breaking through plateaus. To think we know everything about fitness is just absurd. But there is one thing that Working Out is about... it's work. If you think you can coast through and go through the motions just stay home. One quote I use in my classes is "Easy Workouts make Easy Bodies. Hard Workouts make Hard Bodies."