I love Janis Saffell, although she isn't near advanced as Cathe is but her workouts are TONS of fun. Also, I've heard that Turbo Jam is a lot of fun but again, I don't think anyone is as hard as Cathe! Lets just hope she creates more Kickboxing workouts! I have been doing Bodycombat at a gym near home that is kickbutt. You can check to see if they offer that class in a gym near you by looking at lesmills.com (I think that's the website). Good luck.