lol another person that bought products, and then asked "are they any good"
well you didnt buy any pure shit gimmick products. i dont know about hotrox, but its from biotest, and the guys over at t-nation are all over it, so it cant be bad. ZMA and tribulus i feel can be benficial, although theyre not going to make any kind of huge impact on anything. The ZMA is supposed to affect hormone levels, but at the very least, itll help you sleep, and provide some nutrients. Tribulus i strongly feel affects hormones because it makes me break out slightly. I also feel i make noticeable (to me anyway) size and strength gains from it. Nothing major, just a slightly more progress than usual.
Cardio decreases testosterone? Thats a new one. Ive never heard anything about it.