What is the best time/way to do cardio to preserve muscle mass? Right now I do 60 minutes 150bpm (~55 resting 205+ max) before eating anything and then I have a tuna sandwitch, and a glass of juice (which I think reduces muscle loss because of an insulin surge). Is this bad/good? Using a scale and some rickety bodfat calipers I estimate that last week I lost some muscle mass ~2lbs for 6lbs of bodyfat (with the help of some biotest md6). Is this a decent ratio, or can I get better?