I teach extremely popular kickbox classes similar to Turbokick (non-contact to incredible music) and I have always said that the key to this format of cardiokickboxing is to create seamless, safe combinations that people can pick up on quickly. The more complicated you make it, the more frustrated people get and participants return if they feel successful. To keep the intensity high, intersperse sets of cardio drills: jacks, speedskate, fast feet, etc. – that will help you to not have to choreograph the entire 60 minutes. High-energy is a must and intervals help especially when just starting out. Breaking it up to do fast sets of push-ups or short weight segments or even BOSU drills will give you a chance to re-group and re-focus. Best of luck!