Circuit Max consists of 6 cardio+weight cycles in a 5:2 ratio (5 minutes of cardio, 2 minutes of weights). After a low-impact warm-up with kickbox elements thrown in and a brief lower body stretch, there are 2 cycles of hi/lo (mostly HI), a third cycle of floor kickbox, a fourth cycle of step-kickbox, and two cycles of traditional step. Each of these cycles is followed up by two minutes of weighted compound exercises that work the legs (via squats, plie squats, lunges and standing knee extensions / flexions) and upper body muscles so that by the end of the sixth cycle you've hit the shoulders, biceps and triceps twice. (Dumbbells are used in Cathe's production, no barbells.) After the sixth cycle, some stand-alone chest and back work is done, followed by some brief core work with static planks. Then a stretch; I've never done the stretch so I can't describe it.
The entire workout as produced is about an hour (I think).
HTH -
A-Jock