24X Olympia winning coach Hany Rambod answers the question of whether cardio can destroy muscle growth. If you eat too little, are overtrained, or do too much cardio - absolutely, it can.
Always start with 20-30 minutes of cardio and then work your way up. Should cardio be done fasted? No. In a competition prep situation, Hany recommends starting fasted cardio a few weeks into your 12-16 week prep, then increasing cardio to 30-45 minutes and you can add a second session.
You can do up to 60 minutes of cardio if you are really out of shape, up to twice a day, but the key word is not to get so out of shape that you are forced to do this. You want to stay in the range of 20-30 minutes of cardio.
Pro-tip: If you don't eat well, especially if you eat too little, or don't rest properly, you will lose muscle. IsoJect, ultra-pure whey isolate protein, is a great way to supplement your protein with a clean, fast-acting protein post-workout.
Always start with 20-30 minutes of cardio and then work your way up. Should cardio be done fasted? No. In a competition prep situation, Hany recommends starting fasted cardio a few weeks into your 12-16 week prep, then increasing cardio to 30-45 minutes and you can add a second session.
You can do up to 60 minutes of cardio if you are really out of shape, up to twice a day, but the key word is not to get so out of shape that you are forced to do this. You want to stay in the range of 20-30 minutes of cardio.
Pro-tip: If you don't eat well, especially if you eat too little, or don't rest properly, you will lose muscle. IsoJect, ultra-pure whey isolate protein, is a great way to supplement your protein with a clean, fast-acting protein post-workout.



