Alwyn's workouts for fat loss start with high reps, fifteen or so. You do workout A, workout B, repeat and then you lower the reps, increase the weight and shorten the rest period. A typical fat loss routine lasts four to six weeks. By the end you're typically doing 6 to 8 reps, with 30 seconds of rest or less. He also picks the most cardiovascularly taxing exercises like squat, deadlift, lunge, bulgarian split squat, etc. and of course every exercise is a compound movement.
The book New Rules of Lifting has three Fat Loss workouts by Alwyn, each progressively more intense. Continually lower reps, heavier weights and eventually no rest whatsoever. Grueling stuff I'm sure. I'm only about to finish Fat Loss I.