I went to RPM again yesterday and took my first "Gravity Strength" class and I almost passed out. Literally. My scalp started tingling and I had to stop.
After spin class, I walked into a room with 8 contraptions called Gravity. Gravity is a machine that is designed to essentially use your body weight as resistance through a cable pulley system attached to a glide board. The class was led by an instructor and he walked us through a series of exercises that work your entire body like a circuit. There are no breaks between the exercises except when you shift positions on the machines. What I loved about the method is it helps you build functional strength - it mimics stuff that you would do in real life. Really, when would a bench press benefit you in real life except maybe when you decide to frolic with someone way beyond your weight class.
It was tough, but then again I'm kind of a wuss. I loved it and I'll return... likely next month when I recover.
If you do decide to go to Gravity, then bundle up. Man, they gotta turn the heat up at the place coz' it's just too darn cold.