To answer the original question will cardio reduce mass growth, the answer is no, it will actually help with mass growth if done properly. Cardio increases your protein turnover rate with allows you to process more protein, the key is you need to eat more to make up for the extra calories burned. But Ideally you should eat more extra cals than you burned doing cardio to take advantage of this. So if you were eating 4000 cals before with no cardio and you add -300 cals worth of cardio a day you should add say 500 extra cals to offsets it.
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5-10
208lbs
10%bf
Bench-365
Deadlift-525
Squat-425
Total=1315
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