Instruct: Classify Amazon reviews into positive or negative sentiment
Query: P90X plus is an excellent supplement to P90X!

P90X plus is an excellent supplement to P90X to aid muscle confusion and develop overall fitness. My experience is that it focuses more on core and overall fitness and less on muscle building, promoting a lean muscularity. There are many high rep exercises that continue for a period of time, which translates into a lot of reps (i.e., far more than the 8-10 reps that optimally build muscle mass). I have achieved good results doing a full 90 day P90X cycle to bulk up, then doing a month of P90X plus to cut and lean out. I think that this combination keeps me from getting too bulky while building total body strength, fitness and "gristle."