I think these workouts work best for the following goals:
- Maintaining strength, whatever your level of fitness, when you are pressed for time
- Gaining strength if you are an intermediate (or below)exerciser
I love these workouts but use the heaviest weights I can. A lot of the "die hards" seem to think these are too easy, but I personally think they pack a lot of punch into a shorter timeframe if you do go heavy with your weights.
I don't think there are enough reps to make this a good endurance workout.
Just my opinion. I'm sure you'll get lots of those!
Dana