State of the art for fitness centers?
The human body is a state of the art fitness center. Personally, if I had no restrictions on equipment or space, I would have a lot of adjustable cable systems, free weights, a crazy monkey bar set up (insanely complex and bolted down with suspension/elastic hook ups and more), and some type of aquatic set up (like a deep pool/tank, level 4 foot pool/tank, level 3 foot pool/tank). Not just out of the box, but out of this world fitness potential.