in reference to your PM and to answer the ab vs. elsewhere response...
Yohimburn effective in areas of stubborn fat due to oestrogenic influence, to see good effect you need a calorie deficit (except in small areas like face). Stubborn disproportionate fat in Hips, thighs, glutes, chest low back, face, triceps are all usually A2 rich areas. Abs (low and upper), and love handles can be A2 rich or the "stubbornness" may be due to insulin issues. Sometimes its a mixture of both.
stubborn fat due to insulin issues does not respond as well, because the primary causative is impaired sensitivity and insulin over production . Improvement in insulin sensitivity (glucorell, green tea, CARDIO, cutting out hydrogenated oils, cutting out alcohol) is what is needed most.