P90X. Body pump. Turbo fire. All these one size fit all programing doesn't take into account you, the individual. Everyone's posture is different. Your slouched shoulders are not good for overhead pressing. You need more back exercises. You may have tight hips, so getting into any squat position is difficult.
aI was asked about a product called "Fastin" as a dietary aid. After some research I found that this is a product made in the Canada by Global Alliance Corp and disturbed by out of a company in Georgia. It is not a FDA regulated product. Its primary ingredient is phyenylethylamine HCL 245 mg and 100 caffiene.
Well this is an athropology question believe it our not. The anwser is based on the design of the human structure and the reason we are currently top of the food chain. Simply you are designed to succeed in exercise. Here is a good video which shows the how "human" became top of the food chain. http://youtu.be/826HMLoiE_o
Fueling up before a workout is just as important as re-fueling after a workout. Many individuals do neither; they workout simply because they want to go eat that Big Mac at McDonalds, that Krispy Kreme Donut with their coffee in the morning or that giant bowl of ice-cream while watching Biggest Loser. While eating these foods on special occasions and in moderation is by no means a horrible thing to do, eating the aforementioned types of food after a workout, or going without eating right after a workout so that you can eat those foods later, is a big mistake.