Lacey Stone is one bad ass chick. I hung out with her on set, and she is a killer trainer. In her episode of Burn100 she takes you through a series of fairly simple moves that combined as a circuit will get your heart rate sky-high.
There’s no equipment involved so you can do this ANYWHERE.
At this moment in my fitness regimen, any cardio that isn’t SOULCYCLE is always a challenge. I’m starting to sweat just watching the video.