i don't know how safe that would be during cardio, cause your heart has to work hard already when your on juice (your heart is a muscle so it grows just like the rest) which is bad for it, it could take years off your life with how hard it has to work. I would be cautious about doing cardio while on juice. i just don't want you to possibly put more stress on your heart. Do you know what kind of AAS you will be using? i would strongly be against it with something like d-bol or anadrol and a few more of the others, but if it's AAS that is specifically meant to burn fat then i don't see a problem. I don't think you'll shrink much, it would be effective.