Please be patient for a response... there is a new workout part of Hardcore Series "Kick Max", I think that we are "JUST" receiving. Once viewers receive this workout, we will be able to tell you if it is more challenging than "Kick, Punch & Crunch". However, I will say that "Kick, Punch & Crunch" is a really great workout. If you have access to FitTV, it is on there at least once a month...surely more.