Roughly, you do a nice hi/lo warm up and stretch, a 5 minute circuit of hi/lo, a circuit of squats and shoulder presses, 5 more minutes of hi/lo, circuit of lunges and shoulder side lateral raises and squats and front raises, a 5 minute kickbox circuit, more weights, 5 min step, more weights, more step....
You get the picture.
I mostly run and do some Cathe step. I haven't done hi/lo since doing my lovely Jane Fonda video in the late 80's. It was an excellent change of pace.