Great input! I believe a serious workout would involve some sort of lifting routine before hand. This exercise is really just intended to get some cardio/endorphins without being heavily aerobic.
Further off topic, you have essentially described the model that CrossFit uses! You could steal workouts from https://www.crossfit.com/ as the publish them for free. There is also a lot of good material tied to the crossfit name for high intensity interval training if you google around.