Had a great workout today at NDG Wellness. If you're in NYC look into it. I purchased a few classes of the 'Stiletto Workout' on Lifebooker ages ago and finally made time to start redeeming my package today.

As the name suggests, you do the calisthenics-based workout in your heels. Sounds strange, but just think of how you need to engage your core just to maintain your balance walking in heels versus flats. Now imagine doing squats, balance moves and kick-boxing moves- I'm already sore- in that good 'this is working' way.
Check out their website for more details on this class and other fun, sexy classes that will whip you into shape.
http://www.ndgwellness.com/