Kristi is fabulous, fit and strong with an amazing smokey voice and cheerful smile. The smiles soon faded when the core section of the class started and my abs started to yell at me. And then it was all business all the time the next hour of the class when we picked up the weights and started doing crazy plyometrics.
30/60/90 is like the name says: 30 second, 60 second, and 90 second intervals of super intense, athletic moves. In this clip from NY1, Kristi explains that her program is similar to HIIT training, or high intensity interval training. There are plenty of modifications, however, so I never felt like I couldn't participate. The guy in front of me was doing every advanced modification available-- so nice to know that there is room to grow.
Another cool thing: The class changes monthly, so you'll never get bored. And if you get bored doing this workout, you may not be human.
30/60/90 is taught at Equinox gyms here in the New York area. For a schedule, go to http://www.equinox.com/.