I am 10 weeks into a test/mast cycle. I am pretty happy with gains and now want to lean out some. Still planning on running test only for 3-4 more weeks. My question is how much if any muscle could I lose by ramping up cardio to 60-75 minutes ed? I mean heart rate at 160-165 almost the entire time. Would the test allow me to keep muscle if I am getting enough protein in my diet?