Light cardio in moderation is never a bad idea while gaining. Cardio will not make you lose muscle mass or hault your goal of bulking. Excessive cardio will make you burn extra calories that's about it but provided your diet and resistance training as well as rest periods are on ball I can see doing nothing but good for you. Since you love cardio I think your trainer is worried that you may overdo it, meaning go run marathon lengths everyday in the morning, burn a lot of calories, not make up for them in your diet and strain your system so that while you do resistance training you're not 100%. Just do it in moderation and you'll be good. Heck it will probably help you breathe better and stronger while you do heavy weights.



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