I think the first premix (58 min) has the warm up, kickbox combos and leg drills. I haven't done that one yet, but heard it's good. I love the Kickbox Bootcamp Challenge premix! That one has the warm up, followed by the 10 cardio blasts, then the kickbox combos. It's awesome! I also love the Cardio Leg Sculpt premix. This one has the warm up, cardio blasts and leg drills. It may have a kickbox combo, but I don't remember for sure.
If I'm short on time and can't do the whole workout, I will do the Kickbox Bootcamp Challenge if I want all cardio and I'll do the Cardio Leg Sculpt if I want cardio and lower body. I think the first two premixes are good if you don't want high impact.
Hope this helps!
Karen