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First let me say that serious endurance training may impede strength and power training as the adaptation of muscles to endurance training is a decrease in fiber size (muscle cross sectional area is what determines a muscle's ability to produce force) and various other molecular changes in the muscle cells.
Now, to answer your question one of the problems that I have witht he S&P forum is that they primarily talk about lifting heavy and their different rep schemes but do not adress their dynamic effort days, the days they dedicate to low weight, high speed efforts (I know they leave it out because most people who are just starting out would probably not do them safely/properly/with the right form and as a result risk injury to themselves) but work is only half of the work/time equation of power.
Let's face it, you don't need to be able to bench 300lbs to punch hard, and you'll likely throw more punches in a fight than you will perform bench reps in a workout. A lot of the conditioning routines that include 100 pushups and tons of squat jumps are geared more towards muscle endurance/anaerobic metabolic conditioning (compared to aerobic endurance training of the muscle) and GPP (general physical preparation, which is gaining lots of popularity, for example CrossFit) as this may be more important in many of the forum regulars careers and in the fight sports people participate in with 5 minute rounds. In my oppinion, you wouldn't do leg or upper body plyometrics within 48 hours of a normal resistance training day for those muscle groups, as you are taxing them differently than lifting heavy, and causing different adaptations, but those adaptations are ones you would want.
Cardio and GPP and repeated sprint performances and strength and power all require different training strategies, and the truth is, you will need to compromise one for another, as endurance training impeds strength training and sprint training, but you may need to compromise in order to be well rounded and generally fit, versus being extraordinarily strong or having extraordinary stamina. I hope this answered your question.
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