It is one of the biggest fears in the bodybuilding and strength training world: the fear that a session on the treadmill or stationary bike will make all your hard-earned muscle mass disappear like snow in the sun. You often hear that strength athletes consider cardio the ultimate enemy of muscle growth. But is that true?
The 24-time Olympia-winning coach Hany Rambod gives a very clear answer to the question of whether cardio can destroy your muscle gains: If you eat too little, are overtrained, or simply do too much cardio — absolutely, it kills your gains. But if you approach it smartly and strategically, cardio is actually a powerful tool for a shredded physique and better conditioning. In this guide, the Pro Creator explains how to burn fat without sacrificing muscle mass.
The Blueprint: How Much Cardio Is Optimal?
The biggest mistake many athletes make is going straight from zero to hours of cardio per week as soon as they want to cut. This is the fastest way to muscle breakdown and a sluggish metabolism.
Hany Rambod follows a strict step-by-step plan:
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The Starting Phase: Always start defensively with 20 to 30 minutes of cardio per session. This is more than enough to activate your fat burning and support your conditioning without your body entering a catabolic (muscle-breaking) state.
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The Extreme Phase: Only if you are really out of shape can you build this up to a maximum of 60 minutes, possibly split into two sessions per day. Hany’s key advice here is clear: make sure you don’t get so out of shape in the future that you are forced to take such extreme measures. Always try to stay in the safe zone of 20-30 minutes.
Should Cardio Always Be Fasted?
There is a persistent myth that cardio is only effective if done on an empty stomach. Hany Rambod immediately puts this into perspective. Do you have to do cardio fasted? No.
In a specific contest preparation situation, Hany advises introducing fasted cardio only a few weeks into the process — think of the last 12 to 16 weeks before the show. Only at that point do you gradually build fasted sessions up to 30 to 45 minutes and possibly add a second session later in the day. For the regular athlete who just wants a leaner physique, fasted cardio is absolutely not mandatory. Consistency and your total calorie balance are far more important.
The Pro Tip from the Champion Maker: Nutrition & Recovery
Cardio itself is not the culprit; a lack of recovery resources is. If you don’t eat well — especially if you consume too little protein — or if you neglect your sleep, your body will inevitably start burning muscle tissue for energy. Cardio simply increases your energy expenditure, so you need to protect your muscle cells extra.
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The Evogen Solution: The best way to protect and nourish your muscles immediately after a heavy training or cardio session is with a clean, fast-acting protein source. Evogen IsoJect is an ultra-pure whey isolate protein. Thanks to the patented IGNITOR™ enzyme technology, amino acids are delivered lightning-fast to the muscles for immediate recovery and maximum muscle protein synthesis, without weighing heavily on the stomach.
